DO NOT MERGE: Merge Oreo MR1 into master

Exempt-From-Owner-Approval: Changes already landed internally
Change-Id: Iba27925c2239b81f2bab7cdbbefe051d9e0ed5f1

7 files changed, 779 insertions, 372 deletions

diff --git a/README.version b/README.version
index c26473d..58f47fa 100644
--- a/README.version
+++ b/README.version
@@ -1,3 +1,3 @@
-URL: https://sqlite.org/2017/sqlite-amalgamation-3190200.zip
-Version: 3.19.2
+URL: https://sqlite.org/src/tarball/SQLite-605907e7.tar.gz
+Version: 3.19.4 605907e73adb4533
 BugComponent: 24950
diff --git a/dist/Android.bp b/dist/Android.bp
index 7a64c69..2211d1f 100644
--- a/dist/Android.bp
+++ b/dist/Android.bp
@@ -36,10 +36,9 @@ cc_defaults {
         "-DSQLITE_OMIT_LOAD_EXTENSION",
         "-DSQLITE_DEFAULT_FILE_PERMISSIONS=0600",
         "-DSQLITE_SECURE_DELETE",
-        "-Wall",
+        "-DSQLITE_ENABLE_BATCH_ATOMIC_WRITE",
+        "-Wno-unused-parameter",
         "-Werror",
-        "-Wno-error=unused-function",
-        "-Wno-error=unused-parameter",
     ],
 
     target: {
diff --git a/dist/Android.patch b/dist/Android.patch
index 45aa6a9..95cde52 100644
--- a/dist/Android.patch
+++ b/dist/Android.patch
@@ -1,6 +1,6 @@
 diff -r -u -d orig/shell.c ./shell.c
---- orig/shell.c	2017-07-24 11:46:21.256572726 +0900
-+++ ./shell.c	2017-07-24 11:46:21.336572354 +0900
+--- orig/shell.c	2017-07-21 09:46:53.488326209 +0900
++++ ./shell.c	2017-07-21 09:46:53.620324492 +0900
 @@ -52,6 +52,12 @@
  #endif
  #include <ctype.h>
@@ -38,9 +38,9 @@ diff -r -u -d orig/shell.c ./shell.c
  }
  
 diff -r -u -d orig/sqlite3.c ./sqlite3.c
---- orig/sqlite3.c	2017-07-24 11:46:21.332572372 +0900
-+++ ./sqlite3.c	2017-09-07 15:23:58.115384654 +0900
-@@ -33542,7 +33542,7 @@
+--- orig/sqlite3.c	2017-08-04 10:42:31.294648222 +0900
++++ ./sqlite3.c	2017-08-10 13:27:29.784569745 +0900
+@@ -33618,7 +33618,7 @@
    SimulateIOError( rc=1 );
    if( rc!=0 ){
      storeLastErrno((unixFile*)id, errno);
@@ -49,7 +49,7 @@ diff -r -u -d orig/sqlite3.c ./sqlite3.c
    }
    *pSize = buf.st_size;
  
-@@ -33578,7 +33578,7 @@
+@@ -33654,7 +33654,7 @@
      struct stat buf;              /* Used to hold return values of fstat() */
     
      if( osFstat(pFile->h, &buf) ){
@@ -58,7 +58,7 @@ diff -r -u -d orig/sqlite3.c ./sqlite3.c
      }
  
      nSize = ((nByte+pFile->szChunk-1) / pFile->szChunk) * pFile->szChunk;
-@@ -34152,7 +34152,7 @@
+@@ -34262,7 +34262,7 @@
      ** with the same permissions.
      */
      if( osFstat(pDbFd->h, &sStat) ){
@@ -67,7 +67,7 @@ diff -r -u -d orig/sqlite3.c ./sqlite3.c
        goto shm_open_err;
      }
  
-@@ -115928,7 +115928,7 @@
+@@ -116120,7 +116120,7 @@
    }
    if( pDb->pSchema->file_format>SQLITE_MAX_FILE_FORMAT ){
      sqlite3SetString(pzErrMsg, db, "unsupported file format");
@@ -76,7 +76,7 @@ diff -r -u -d orig/sqlite3.c ./sqlite3.c
      goto initone_error_out;
    }
  
-@@ -149763,13 +149763,25 @@
+@@ -149914,13 +149914,25 @@
    ** module with sqlite.
    */
    if( SQLITE_OK==rc 
diff --git a/dist/orig/sqlite3.c b/dist/orig/sqlite3.c
index 657a54e..b036aa1 100644
--- a/dist/orig/sqlite3.c
+++ b/dist/orig/sqlite3.c
@@ -1,6 +1,6 @@
 /******************************************************************************
 ** This file is an amalgamation of many separate C source files from SQLite
-** version 3.19.2.  By combining all the individual C code files into this
+** version 3.19.4.  By combining all the individual C code files into this
 ** single large file, the entire code can be compiled as a single translation
 ** unit.  This allows many compilers to do optimizations that would not be
 ** possible if the files were compiled separately.  Performance improvements
@@ -398,9 +398,9 @@ extern "C" {
 ** [sqlite3_libversion_number()], [sqlite3_sourceid()],
 ** [sqlite_version()] and [sqlite_source_id()].
 */
-#define SQLITE_VERSION        "3.19.2"
-#define SQLITE_VERSION_NUMBER 3019002
-#define SQLITE_SOURCE_ID      "2017-05-25 16:50:27 edb4e819b0c058c7d74d27ebd14cc5ceb2bad6a6144a486a970182b7afe3f8b9"
+#define SQLITE_VERSION        "3.19.4"
+#define SQLITE_VERSION_NUMBER 3019004
+#define SQLITE_SOURCE_ID      "2017-08-18 19:28:12 605907e73adb4533b12d22be8422f17a8dc125b5c37bb391756a11fc3a8c4d10"
 
 /*
 ** CAPI3REF: Run-Time Library Version Numbers
@@ -771,6 +771,9 @@ SQLITE_API int sqlite3_exec(
 #define SQLITE_IOERR_CONVPATH          (SQLITE_IOERR | (26<<8))
 #define SQLITE_IOERR_VNODE             (SQLITE_IOERR | (27<<8))
 #define SQLITE_IOERR_AUTH              (SQLITE_IOERR | (28<<8))
+#define SQLITE_IOERR_BEGIN_ATOMIC      (SQLITE_IOERR | (29<<8))
+#define SQLITE_IOERR_COMMIT_ATOMIC     (SQLITE_IOERR | (30<<8))
+#define SQLITE_IOERR_ROLLBACK_ATOMIC   (SQLITE_IOERR | (31<<8))
 #define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
 #define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
 #define SQLITE_BUSY_SNAPSHOT           (SQLITE_BUSY   |  (2<<8))
@@ -857,6 +860,11 @@ SQLITE_API int sqlite3_exec(
 ** SQLITE_IOCAP_IMMUTABLE flag indicates that the file is on
 ** read-only media and cannot be changed even by processes with
 ** elevated privileges.
+**
+** The SQLITE_IOCAP_BATCH_ATOMIC property means that the underlying
+** filesystem supports doing multiple write operations atomically when those
+** write operations are bracketed by [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] and
+** [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].
 */
 #define SQLITE_IOCAP_ATOMIC                 0x00000001
 #define SQLITE_IOCAP_ATOMIC512              0x00000002
@@ -872,6 +880,7 @@ SQLITE_API int sqlite3_exec(
 #define SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN  0x00000800
 #define SQLITE_IOCAP_POWERSAFE_OVERWRITE    0x00001000
 #define SQLITE_IOCAP_IMMUTABLE              0x00002000
+#define SQLITE_IOCAP_BATCH_ATOMIC           0x00004000
 
 /*
 ** CAPI3REF: File Locking Levels
@@ -1006,6 +1015,7 @@ struct sqlite3_file {
 ** <li> [SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN]
 ** <li> [SQLITE_IOCAP_POWERSAFE_OVERWRITE]
 ** <li> [SQLITE_IOCAP_IMMUTABLE]
+** <li> [SQLITE_IOCAP_BATCH_ATOMIC]
 ** </ul>
 **
 ** The SQLITE_IOCAP_ATOMIC property means that all writes of
@@ -1289,6 +1299,40 @@ struct sqlite3_io_methods {
 ** The [SQLITE_FCNTL_RBU] opcode is implemented by the special VFS used by
 ** the RBU extension only.  All other VFS should return SQLITE_NOTFOUND for
 ** this opcode.  
+**
+** <li>[[SQLITE_FCNTL_BEGIN_ATOMIC_WRITE]]
+** If the [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] opcode returns SQLITE_OK, then
+** the file descriptor is placed in "batch write mode", which
+** means all subsequent write operations will be deferred and done
+** atomically at the next [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].  Systems
+** that do not support batch atomic writes will return SQLITE_NOTFOUND.
+** ^Following a successful SQLITE_FCNTL_BEGIN_ATOMIC_WRITE and prior to
+** the closing [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] or
+** [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE], SQLite will make
+** no VFS interface calls on the same [sqlite3_file] file descriptor
+** except for calls to the xWrite method and the xFileControl method
+** with [SQLITE_FCNTL_SIZE_HINT].
+**
+** <li>[[SQLITE_FCNTL_COMMIT_ATOMIC_WRITE]]
+** The [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] opcode causes all write
+** operations since the previous successful call to 
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be performed atomically.
+** This file control returns [SQLITE_OK] if and only if the writes were
+** all performed successfully and have been committed to persistent storage.
+** ^Regardless of whether or not it is successful, this file control takes
+** the file descriptor out of batch write mode so that all subsequent
+** write operations are independent.
+** ^SQLite will never invoke SQLITE_FCNTL_COMMIT_ATOMIC_WRITE without
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
+**
+** <li>[[SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE]]
+** The [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE] opcode causes all write
+** operations since the previous successful call to 
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be rolled back.
+** ^This file control takes the file descriptor out of batch write mode
+** so that all subsequent write operations are independent.
+** ^SQLite will never invoke SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE without
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
 ** </ul>
 */
 #define SQLITE_FCNTL_LOCKSTATE               1
@@ -1320,6 +1364,9 @@ struct sqlite3_io_methods {
 #define SQLITE_FCNTL_JOURNAL_POINTER        28
 #define SQLITE_FCNTL_WIN32_GET_HANDLE       29
 #define SQLITE_FCNTL_PDB                    30
+#define SQLITE_FCNTL_BEGIN_ATOMIC_WRITE     31
+#define SQLITE_FCNTL_COMMIT_ATOMIC_WRITE    32
+#define SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE  33
 
 /* deprecated names */
 #define SQLITE_GET_LOCKPROXYFILE      SQLITE_FCNTL_GET_LOCKPROXYFILE
@@ -11721,6 +11768,15 @@ SQLITE_PRIVATE void sqlite3HashClear(Hash*);
 #endif
 
 /*
+** The compile-time options SQLITE_MMAP_READWRITE and 
+** SQLITE_ENABLE_BATCH_ATOMIC_WRITE are not compatible with one another.
+** You must choose one or the other (or neither) but not both.
+*/
+#if defined(SQLITE_MMAP_READWRITE) && defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+#error Cannot use both SQLITE_MMAP_READWRITE and SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+#endif
+
+/*
 ** GCC does not define the offsetof() macro so we'll have to do it
 ** ourselves.
 */
@@ -17036,7 +17092,8 @@ SQLITE_PRIVATE int sqlite3FindInIndex(Parse *, Expr *, u32, int*, int*);
 
 SQLITE_PRIVATE int sqlite3JournalOpen(sqlite3_vfs *, const char *, sqlite3_file *, int, int);
 SQLITE_PRIVATE int sqlite3JournalSize(sqlite3_vfs *);
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
 SQLITE_PRIVATE   int sqlite3JournalCreate(sqlite3_file *);
 #endif
 
@@ -17540,6 +17597,9 @@ static const char * const azCompileOpt[] = {
 #if SQLITE_ENABLE_ATOMIC_WRITE
   "ENABLE_ATOMIC_WRITE",
 #endif
+#if SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+  "ENABLE_BATCH_ATOMIC_WRITE",
+#endif
 #if SQLITE_ENABLE_CEROD
   "ENABLE_CEROD",
 #endif
@@ -29775,6 +29835,7 @@ SQLITE_PRIVATE const char *sqlite3OpcodeName(int i){
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <sys/ioctl.h>
 #include <unistd.h>
 /* #include <time.h> */
 #include <sys/time.h>
@@ -29784,7 +29845,7 @@ SQLITE_PRIVATE const char *sqlite3OpcodeName(int i){
 #endif
 
 #if SQLITE_ENABLE_LOCKING_STYLE
-# include <sys/ioctl.h>
+/* # include <sys/ioctl.h> */
 # include <sys/file.h>
 # include <sys/param.h>
 #endif /* SQLITE_ENABLE_LOCKING_STYLE */
@@ -29905,10 +29966,8 @@ struct unixFile {
   sqlite3_int64 mmapSizeMax;          /* Configured FCNTL_MMAP_SIZE value */
   void *pMapRegion;                   /* Memory mapped region */
 #endif
-#ifdef __QNXNTO__
   int sectorSize;                     /* Device sector size */
   int deviceCharacteristics;          /* Precomputed device characteristics */
-#endif
 #if SQLITE_ENABLE_LOCKING_STYLE
   int openFlags;                      /* The flags specified at open() */
 #endif
@@ -30211,6 +30270,20 @@ SQLITE_API extern int sqlite3_open_file_count;
 # define lseek lseek64
 #endif
 
+#ifdef __linux__
+/*
+** Linux-specific IOCTL magic numbers used for controlling F2FS
+*/
+#define F2FS_IOCTL_MAGIC        0xf5
+#define F2FS_IOC_START_ATOMIC_WRITE     _IO(F2FS_IOCTL_MAGIC, 1)
+#define F2FS_IOC_COMMIT_ATOMIC_WRITE    _IO(F2FS_IOCTL_MAGIC, 2)
+#define F2FS_IOC_START_VOLATILE_WRITE   _IO(F2FS_IOCTL_MAGIC, 3)
+#define F2FS_IOC_ABORT_VOLATILE_WRITE   _IO(F2FS_IOCTL_MAGIC, 5)
+#define F2FS_IOC_GET_FEATURES           _IOR(F2FS_IOCTL_MAGIC, 12, u32)
+#define F2FS_FEATURE_ATOMIC_WRITE 0x0004
+#endif /* __linux__ */
+
+
 /*
 ** Different Unix systems declare open() in different ways.  Same use
 ** open(const char*,int,mode_t).  Others use open(const char*,int,...).
@@ -30383,6 +30456,9 @@ static struct unix_syscall {
 #endif
 #define osLstat      ((int(*)(const char*,struct stat*))aSyscall[27].pCurrent)
 
+  { "ioctl",         (sqlite3_syscall_ptr)ioctl,          0 },
+#define osIoctl ((int(*)(int,int,...))aSyscall[28].pCurrent)
+
 }; /* End of the overrideable system calls */
 
 
@@ -33660,6 +33736,21 @@ static int unixGetTempname(int nBuf, char *zBuf);
 static int unixFileControl(sqlite3_file *id, int op, void *pArg){
   unixFile *pFile = (unixFile*)id;
   switch( op ){
+#if defined(__linux__) && defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+    case SQLITE_FCNTL_BEGIN_ATOMIC_WRITE: {
+      int rc = osIoctl(pFile->h, F2FS_IOC_START_ATOMIC_WRITE);
+      return rc ? SQLITE_IOERR_BEGIN_ATOMIC : SQLITE_OK;
+    }
+    case SQLITE_FCNTL_COMMIT_ATOMIC_WRITE: {
+      int rc = osIoctl(pFile->h, F2FS_IOC_COMMIT_ATOMIC_WRITE);
+      return rc ? SQLITE_IOERR_COMMIT_ATOMIC : SQLITE_OK;
+    }
+    case SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE: {
+      int rc = osIoctl(pFile->h, F2FS_IOC_ABORT_VOLATILE_WRITE);
+      return rc ? SQLITE_IOERR_ROLLBACK_ATOMIC : SQLITE_OK;
+    }
+#endif /* __linux__ && SQLITE_ENABLE_BATCH_ATOMIC_WRITE */
+
     case SQLITE_FCNTL_LOCKSTATE: {
       *(int*)pArg = pFile->eFileLock;
       return SQLITE_OK;
@@ -33743,30 +33834,41 @@ static int unixFileControl(sqlite3_file *id, int op, void *pArg){
 }
 
 /*
-** Return the sector size in bytes of the underlying block device for
-** the specified file. This is almost always 512 bytes, but may be
-** larger for some devices.
+** If pFd->sectorSize is non-zero when this function is called, it is a
+** no-op. Otherwise, the values of pFd->sectorSize and 
+** pFd->deviceCharacteristics are set according to the file-system 
+** characteristics. 
 **
-** SQLite code assumes this function cannot fail. It also assumes that
-** if two files are created in the same file-system directory (i.e.
-** a database and its journal file) that the sector size will be the
-** same for both.
+** There are two versions of this function. One for QNX and one for all
+** other systems.
 */
-#ifndef __QNXNTO__ 
-static int unixSectorSize(sqlite3_file *NotUsed){
-  UNUSED_PARAMETER(NotUsed);
-  return SQLITE_DEFAULT_SECTOR_SIZE;
-}
-#endif
+#ifndef __QNXNTO__
+static void setDeviceCharacteristics(unixFile *pFd){
+  assert( pFd->deviceCharacteristics==0 || pFd->sectorSize!=0 );
+  if( pFd->sectorSize==0 ){
+#if defined(__linux__) && defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+    int res;
+    u32 f = 0;
 
-/*
-** The following version of unixSectorSize() is optimized for QNX.
-*/
-#ifdef __QNXNTO__
+    /* Check for support for F2FS atomic batch writes. */
+    res = osIoctl(pFd->h, F2FS_IOC_GET_FEATURES, &f);
+    if( res==0 && (f & F2FS_FEATURE_ATOMIC_WRITE) ){
+      pFd->deviceCharacteristics = SQLITE_IOCAP_BATCH_ATOMIC;
+    }
+#endif /* __linux__ && SQLITE_ENABLE_BATCH_ATOMIC_WRITE */
+
+    /* Set the POWERSAFE_OVERWRITE flag if requested. */
+    if( pFd->ctrlFlags & UNIXFILE_PSOW ){
+      pFd->deviceCharacteristics |= SQLITE_IOCAP_POWERSAFE_OVERWRITE;
+    }
+
+    pFd->sectorSize = SQLITE_DEFAULT_SECTOR_SIZE;
+  }
+}
+#else
 #include <sys/dcmd_blk.h>
 #include <sys/statvfs.h>
-static int unixSectorSize(sqlite3_file *id){
-  unixFile *pFile = (unixFile*)id;
+static void setDeviceCharacteristics(unixFile *pFile){
   if( pFile->sectorSize == 0 ){
     struct statvfs fsInfo;
        
@@ -33835,9 +33937,24 @@ static int unixSectorSize(sqlite3_file *id){
     pFile->deviceCharacteristics = 0;
     pFile->sectorSize = SQLITE_DEFAULT_SECTOR_SIZE;
   }
-  return pFile->sectorSize;
 }
-#endif /* __QNXNTO__ */
+#endif
+
+/*
+** Return the sector size in bytes of the underlying block device for
+** the specified file. This is almost always 512 bytes, but may be
+** larger for some devices.
+**
+** SQLite code assumes this function cannot fail. It also assumes that
+** if two files are created in the same file-system directory (i.e.
+** a database and its journal file) that the sector size will be the
+** same for both.
+*/
+static int unixSectorSize(sqlite3_file *id){
+  unixFile *pFd = (unixFile*)id;
+  setDeviceCharacteristics(pFd);
+  return pFd->sectorSize;
+}
 
 /*
 ** Return the device characteristics for the file.
@@ -33853,16 +33970,9 @@ static int unixSectorSize(sqlite3_file *id){
 ** available to turn it off and URI query parameter available to turn it off.
 */
 static int unixDeviceCharacteristics(sqlite3_file *id){
-  unixFile *p = (unixFile*)id;
-  int rc = 0;
-#ifdef __QNXNTO__
-  if( p->sectorSize==0 ) unixSectorSize(id);
-  rc = p->deviceCharacteristics;
-#endif
-  if( p->ctrlFlags & UNIXFILE_PSOW ){
-    rc |= SQLITE_IOCAP_POWERSAFE_OVERWRITE;
-  }
-  return rc;
+  unixFile *pFd = (unixFile*)id;
+  setDeviceCharacteristics(pFd);
+  return pFd->deviceCharacteristics;
 }
 
 #if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0
@@ -37481,7 +37591,7 @@ SQLITE_API int sqlite3_os_init(void){
 
   /* Double-check that the aSyscall[] array has been constructed
   ** correctly.  See ticket [bb3a86e890c8e96ab] */
-  assert( ArraySize(aSyscall)==28 );
+  assert( ArraySize(aSyscall)==29 );
 
   /* Register all VFSes defined in the aVfs[] array */
   for(i=0; i<(sizeof(aVfs)/sizeof(sqlite3_vfs)); i++){
@@ -47864,6 +47974,7 @@ static int assert_pager_state(Pager *p){
       assert( isOpen(p->jfd) 
            || p->journalMode==PAGER_JOURNALMODE_OFF 
            || p->journalMode==PAGER_JOURNALMODE_WAL 
+           || (sqlite3OsDeviceCharacteristics(p->fd)&SQLITE_IOCAP_BATCH_ATOMIC)
       );
       assert( pPager->dbOrigSize<=pPager->dbHintSize );
       break;
@@ -47875,6 +47986,7 @@ static int assert_pager_state(Pager *p){
       assert( isOpen(p->jfd) 
            || p->journalMode==PAGER_JOURNALMODE_OFF 
            || p->journalMode==PAGER_JOURNALMODE_WAL 
+           || (sqlite3OsDeviceCharacteristics(p->fd)&SQLITE_IOCAP_BATCH_ATOMIC)
       );
       break;
 
@@ -48085,34 +48197,45 @@ static int pagerLockDb(Pager *pPager, int eLock){
 }
 
 /*
-** This function determines whether or not the atomic-write optimization
-** can be used with this pager. The optimization can be used if:
+** This function determines whether or not the atomic-write or
+** atomic-batch-write optimizations can be used with this pager. The
+** atomic-write optimization can be used if:
 **
 **  (a) the value returned by OsDeviceCharacteristics() indicates that
 **      a database page may be written atomically, and
 **  (b) the value returned by OsSectorSize() is less than or equal
 **      to the page size.
 **
-** The optimization is also always enabled for temporary files. It is
-** an error to call this function if pPager is opened on an in-memory
-** database.
+** If it can be used, then the value returned is the size of the journal 
+** file when it contains rollback data for exactly one page.
 **
-** If the optimization cannot be used, 0 is returned. If it can be used,
-** then the value returned is the size of the journal file when it
-** contains rollback data for exactly one page.
+** The atomic-batch-write optimization can be used if OsDeviceCharacteristics()
+** returns a value with the SQLITE_IOCAP_BATCH_ATOMIC bit set. -1 is
+** returned in this case.
+**
+** If neither optimization can be used, 0 is returned.
 */
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
 static int jrnlBufferSize(Pager *pPager){
   assert( !MEMDB );
-  if( !pPager->tempFile ){
-    int dc;                           /* Device characteristics */
-    int nSector;                      /* Sector size */
-    int szPage;                       /* Page size */
 
-    assert( isOpen(pPager->fd) );
-    dc = sqlite3OsDeviceCharacteristics(pPager->fd);
-    nSector = pPager->sectorSize;
-    szPage = pPager->pageSize;
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+  int dc;                           /* Device characteristics */
+
+  assert( isOpen(pPager->fd) );
+  dc = sqlite3OsDeviceCharacteristics(pPager->fd);
+#endif
+
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+  if( dc&SQLITE_IOCAP_BATCH_ATOMIC ){
+    return -1;
+  }
+#endif
+
+#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+  {
+    int nSector = pPager->sectorSize;
+    int szPage = pPager->pageSize;
 
     assert(SQLITE_IOCAP_ATOMIC512==(512>>8));
     assert(SQLITE_IOCAP_ATOMIC64K==(65536>>8));
@@ -48122,11 +48245,11 @@ static int jrnlBufferSize(Pager *pPager){
   }
 
   return JOURNAL_HDR_SZ(pPager) + JOURNAL_PG_SZ(pPager);
-}
-#else
-# define jrnlBufferSize(x) 0
 #endif
 
+  return 0;
+}
+
 /*
 ** If SQLITE_CHECK_PAGES is defined then we do some sanity checking
 ** on the cache using a hash function.  This is used for testing
@@ -48929,7 +49052,9 @@ static int pager_end_transaction(Pager *pPager, int hasMaster, int bCommit){
   }
 
   releaseAllSavepoints(pPager);
-  assert( isOpen(pPager->jfd) || pPager->pInJournal==0 );
+  assert( isOpen(pPager->jfd) || pPager->pInJournal==0 
+      || (sqlite3OsDeviceCharacteristics(pPager->fd)&SQLITE_IOCAP_BATCH_ATOMIC)
+  );
   if( isOpen(pPager->jfd) ){
     assert( !pagerUseWal(pPager) );
 
@@ -51486,6 +51611,13 @@ static int pagerStress(void *p, PgHdr *pPg){
       rc = pagerWalFrames(pPager, pPg, 0, 0);
     }
   }else{
+    
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+    if( pPager->tempFile==0 ){
+      rc = sqlite3JournalCreate(pPager->jfd);
+      if( rc!=SQLITE_OK ) return pager_error(pPager, rc);
+    }
+#endif
   
     /* Sync the journal file if required. */
     if( pPg->flags&PGHDR_NEED_SYNC 
@@ -53271,6 +53403,21 @@ SQLITE_PRIVATE int sqlite3PagerCommitPhaseOne(
         sqlite3PcacheCleanAll(pPager->pPCache);
       }
     }else{
+      /* The bBatch boolean is true if the batch-atomic-write commit method
+      ** should be used.  No rollback journal is created if batch-atomic-write
+      ** is enabled.
+      */
+      sqlite3_file *fd = pPager->fd;
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+      const int bBatch = zMaster==0    /* An SQLITE_IOCAP_BATCH_ATOMIC commit */
+        && (sqlite3OsDeviceCharacteristics(fd) & SQLITE_IOCAP_BATCH_ATOMIC)
+        && !pPager->noSync
+        && sqlite3JournalIsInMemory(pPager->jfd);
+#else
+# define bBatch 0
+#endif
+
+#ifdef SQLITE_ENABLE_ATOMIC_WRITE
       /* The following block updates the change-counter. Exactly how it
       ** does this depends on whether or not the atomic-update optimization
       ** was enabled at compile time, and if this transaction meets the 
@@ -53294,33 +53441,40 @@ SQLITE_PRIVATE int sqlite3PagerCommitPhaseOne(
       ** in 'direct' mode. In this case the journal file will never be
       ** created for this transaction.
       */
-  #ifdef SQLITE_ENABLE_ATOMIC_WRITE
-      PgHdr *pPg;
-      assert( isOpen(pPager->jfd) 
-           || pPager->journalMode==PAGER_JOURNALMODE_OFF 
-           || pPager->journalMode==PAGER_JOURNALMODE_WAL 
-      );
-      if( !zMaster && isOpen(pPager->jfd) 
-       && pPager->journalOff==jrnlBufferSize(pPager) 
-       && pPager->dbSize>=pPager->dbOrigSize
-       && (0==(pPg = sqlite3PcacheDirtyList(pPager->pPCache)) || 0==pPg->pDirty)
-      ){
-        /* Update the db file change counter via the direct-write method. The 
-        ** following call will modify the in-memory representation of page 1 
-        ** to include the updated change counter and then write page 1 
-        ** directly to the database file. Because of the atomic-write 
-        ** property of the host file-system, this is safe.
-        */
-        rc = pager_incr_changecounter(pPager, 1);
-      }else{
-        rc = sqlite3JournalCreate(pPager->jfd);
-        if( rc==SQLITE_OK ){
-          rc = pager_incr_changecounter(pPager, 0);
+      if( bBatch==0 ){
+        PgHdr *pPg;
+        assert( isOpen(pPager->jfd) 
+            || pPager->journalMode==PAGER_JOURNALMODE_OFF 
+            || pPager->journalMode==PAGER_JOURNALMODE_WAL 
+            );
+        if( !zMaster && isOpen(pPager->jfd) 
+         && pPager->journalOff==jrnlBufferSize(pPager) 
+         && pPager->dbSize>=pPager->dbOrigSize
+         && (!(pPg = sqlite3PcacheDirtyList(pPager->pPCache)) || 0==pPg->pDirty)
+        ){
+          /* Update the db file change counter via the direct-write method. The 
+          ** following call will modify the in-memory representation of page 1 
+          ** to include the updated change counter and then write page 1 
+          ** directly to the database file. Because of the atomic-write 
+          ** property of the host file-system, this is safe.
+          */
+          rc = pager_incr_changecounter(pPager, 1);
+        }else{
+          rc = sqlite3JournalCreate(pPager->jfd);
+          if( rc==SQLITE_OK ){
+            rc = pager_incr_changecounter(pPager, 0);
+          }
         }
       }
-  #else
+#else 
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+      if( zMaster ){
+        rc = sqlite3JournalCreate(pPager->jfd);
+        if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
+      }
+#endif
       rc = pager_incr_changecounter(pPager, 0);
-  #endif
+#endif
       if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
   
       /* Write the master journal name into the journal file. If a master 
@@ -53343,8 +53497,24 @@ SQLITE_PRIVATE int sqlite3PagerCommitPhaseOne(
       */
       rc = syncJournal(pPager, 0);
       if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
-  
+
+      if( bBatch ){
+        /* The pager is now in DBMOD state. But regardless of what happens
+        ** next, attempting to play the journal back into the database would
+        ** be unsafe. Close it now to make sure that does not happen.  */
+        sqlite3OsClose(pPager->jfd);
+        rc = sqlite3OsFileControl(fd, SQLITE_FCNTL_BEGIN_ATOMIC_WRITE, 0);
+        if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
+      }
       rc = pager_write_pagelist(pPager,sqlite3PcacheDirtyList(pPager->pPCache));
+      if( bBatch ){
+        if( rc==SQLITE_OK ){
+          rc = sqlite3OsFileControl(fd, SQLITE_FCNTL_COMMIT_ATOMIC_WRITE, 0);
+        }else{
+          sqlite3OsFileControl(fd, SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE, 0);
+        }
+      }
+
       if( rc!=SQLITE_OK ){
         assert( rc!=SQLITE_IOERR_BLOCKED );
         goto commit_phase_one_exit;
@@ -67208,12 +67378,18 @@ SQLITE_PRIVATE int sqlite3BtreeInsert(
       memcpy(newCell, oldCell, 4);
     }
     rc = clearCell(pPage, oldCell, &info);
-    if( info.nSize==szNew && info.nLocal==info.nPayload ){
+    if( info.nSize==szNew && info.nLocal==info.nPayload 
+     && (!ISAUTOVACUUM || szNew<pPage->minLocal)
+    ){
       /* Overwrite the old cell with the new if they are the same size.
       ** We could also try to do this if the old cell is smaller, then add
       ** the leftover space to the free list.  But experiments show that
       ** doing that is no faster then skipping this optimization and just
-      ** calling dropCell() and insertCell(). */
+      ** calling dropCell() and insertCell(). 
+      **
+      ** This optimization cannot be used on an autovacuum database if the
+      ** new entry uses overflow pages, as the insertCell() call below is
+      ** necessary to add the PTRMAP_OVERFLOW1 pointer-map entry.  */
       assert( rc==SQLITE_OK ); /* clearCell never fails when nLocal==nPayload */
       if( oldCell+szNew > pPage->aDataEnd ) return SQLITE_CORRUPT_BKPT;
       memcpy(oldCell, newCell, szNew);
@@ -88855,7 +89031,8 @@ static int memjrnlRead(
   int iChunkOffset;
   FileChunk *pChunk;
 
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
   if( (iAmt+iOfst)>p->endpoint.iOffset ){
     return SQLITE_IOERR_SHORT_READ;
   }
@@ -88974,7 +89151,8 @@ static int memjrnlWrite(
     ** atomic-write optimization. In this case the first 28 bytes of the
     ** journal file may be written as part of committing the transaction. */ 
     assert( iOfst==p->endpoint.iOffset || iOfst==0 );
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
     if( iOfst==0 && p->pFirst ){
       assert( p->nChunkSize>iAmt );
       memcpy((u8*)p->pFirst->zChunk, zBuf, iAmt);
@@ -89143,17 +89321,31 @@ SQLITE_PRIVATE void sqlite3MemJournalOpen(sqlite3_file *pJfd){
   sqlite3JournalOpen(0, 0, pJfd, 0, -1);
 }
 
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
 /*
 ** If the argument p points to a MemJournal structure that is not an 
 ** in-memory-only journal file (i.e. is one that was opened with a +ve
-** nSpill parameter), and the underlying file has not yet been created, 
-** create it now.
+** nSpill parameter or as SQLITE_OPEN_MAIN_JOURNAL), and the underlying 
+** file has not yet been created, create it now.
 */
-SQLITE_PRIVATE int sqlite3JournalCreate(sqlite3_file *p){
+SQLITE_PRIVATE int sqlite3JournalCreate(sqlite3_file *pJfd){
   int rc = SQLITE_OK;
-  if( p->pMethods==&MemJournalMethods && ((MemJournal*)p)->nSpill>0 ){
-    rc = memjrnlCreateFile((MemJournal*)p);
+  MemJournal *p = (MemJournal*)pJfd;
+  if( p->pMethod==&MemJournalMethods && (
+#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+     p->nSpill>0
+#else
+     /* While this appears to not be possible without ATOMIC_WRITE, the
+     ** paths are complex, so it seems prudent to leave the test in as
+     ** a NEVER(), in case our analysis is subtly flawed. */
+     NEVER(p->nSpill>0)
+#endif
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+     || (p->flags & SQLITE_OPEN_MAIN_JOURNAL)
+#endif
+  )){
+    rc = memjrnlCreateFile(p);
   }
   return rc;
 }
@@ -101424,15 +101616,6 @@ static void convertToWithoutRowidTable(Parse *pParse, Table *pTab){
   }else{
     pPk = sqlite3PrimaryKeyIndex(pTab);
 
-    /* Bypass the creation of the PRIMARY KEY btree and the sqlite_master
-    ** table entry. This is only required if currently generating VDBE
-    ** code for a CREATE TABLE (not when parsing one as part of reading
-    ** a database schema).  */
-    if( v ){
-      assert( db->init.busy==0 );
-      sqlite3VdbeChangeOpcode(v, pPk->tnum, OP_Goto);
-    }
-
     /*
     ** Remove all redundant columns from the PRIMARY KEY.  For example, change
     ** "PRIMARY KEY(a,b,a,b,c,b,c,d)" into just "PRIMARY KEY(a,b,c,d)".  Later
@@ -101452,6 +101635,15 @@ static void convertToWithoutRowidTable(Parse *pParse, Table *pTab){
   if( !db->init.imposterTable ) pPk->uniqNotNull = 1;
   nPk = pPk->nKeyCol;
 
+  /* Bypass the creation of the PRIMARY KEY btree and the sqlite_master
+  ** table entry. This is only required if currently generating VDBE
+  ** code for a CREATE TABLE (not when parsing one as part of reading
+  ** a database schema).  */
+  if( v && pPk->tnum>0 ){
+    assert( db->init.busy==0 );
+    sqlite3VdbeChangeOpcode(v, pPk->tnum, OP_Goto);
+  }
+
   /* The root page of the PRIMARY KEY is the table root page */
   pPk->tnum = pTab->tnum;
 
@@ -117953,13 +118145,10 @@ static const char *columnTypeImpl(
         ** of the SELECT statement. Return the declaration type and origin
         ** data for the result-set column of the sub-select.
         */
-        if( iCol>=0 && ALWAYS(iCol<pS->pEList->nExpr) ){
+        if( iCol>=0 && iCol<pS->pEList->nExpr ){
           /* If iCol is less than zero, then the expression requests the
           ** rowid of the sub-select or view. This expression is legal (see 
           ** test case misc2.2.2) - it always evaluates to NULL.
-          **
-          ** The ALWAYS() is because iCol>=pS->pEList->nExpr will have been
-          ** caught already by name resolution.
           */
           NameContext sNC;
           Expr *p = pS->pEList->a[iCol].pExpr;
@@ -118069,18 +118258,6 @@ static void generateColumnTypes(
 #endif /* !defined(SQLITE_OMIT_DECLTYPE) */
 }
 
-/*
-** Return the Table objecct in the SrcList that has cursor iCursor.
-** Or return NULL if no such Table object exists in the SrcList.
-*/
-static Table *tableWithCursor(SrcList *pList, int iCursor){
-  int j;
-  for(j=0; j<pList->nSrc; j++){
-    if( pList->a[j].iCursor==iCursor ) return pList->a[j].pTab;
-  }
-  return 0;
-}
-
 
 /*
 ** Generate code that will tell the VDBE the names of columns
@@ -118089,14 +118266,16 @@ static Table *tableWithCursor(SrcList *pList, int iCursor){
 */
 static void generateColumnNames(
   Parse *pParse,      /* Parser context */
-  SrcList *pTabList,  /* List of tables */
-  ExprList *pEList    /* Expressions defining the result set */
+  Select *pSelect     /* Generate column names for this SELECT statement */
 ){
   Vdbe *v = pParse->pVdbe;
   int i;
   Table *pTab;
+  SrcList *pTabList;
+  ExprList *pEList;
   sqlite3 *db = pParse->db;
-  int fullNames, shortNames;
+  int fullName;    /* TABLE.COLUMN if no AS clause and is a direct table ref */
+  int srcName;     /* COLUMN or TABLE.COLUMN if no AS clause and is direct */
 
 #ifndef SQLITE_OMIT_EXPLAIN
   /* If this is an EXPLAIN, skip this step */
@@ -118106,24 +118285,29 @@ static void generateColumnNames(
 #endif
 
   if( pParse->colNamesSet || db->mallocFailed ) return;
+  /* Column names are determined by the left-most term of a compound select */
+  while( pSelect->pPrior ) pSelect = pSelect->pPrior;
+  pTabList = pSelect->pSrc;
+  pEList = pSelect->pEList;
   assert( v!=0 );
   assert( pTabList!=0 );
   pParse->colNamesSet = 1;
-  fullNames = (db->flags & SQLITE_FullColNames)!=0;
-  shortNames = (db->flags & SQLITE_ShortColNames)!=0;
+  fullName = (db->flags & SQLITE_FullColNames)!=0;
+  srcName = (db->flags & SQLITE_ShortColNames)!=0 || fullName;
   sqlite3VdbeSetNumCols(v, pEList->nExpr);
   for(i=0; i<pEList->nExpr; i++){
-    Expr *p;
-    p = pEList->a[i].pExpr;
-    if( NEVER(p==0) ) continue;
+    Expr *p = pEList->a[i].pExpr;
+
+    assert( p!=0 );
     if( pEList->a[i].zName ){
+      /* An AS clause always takes first priority */
       char *zName = pEList->a[i].zName;
       sqlite3VdbeSetColName(v, i, COLNAME_NAME, zName, SQLITE_TRANSIENT);
-    }else if( (p->op==TK_COLUMN || p->op==TK_AGG_COLUMN)
-           && (pTab = tableWithCursor(pTabList, p->iTable))!=0
-    ){
+    }else if( srcName && p->op==TK_COLUMN ){
       char *zCol;
       int iCol = p->iColumn;
+      pTab = p->pTab;
+      assert( pTab!=0 );
       if( iCol<0 ) iCol = pTab->iPKey;
       assert( iCol==-1 || (iCol>=0 && iCol<pTab->nCol) );
       if( iCol<0 ){
@@ -118131,10 +118315,7 @@ static void generateColumnNames(
       }else{
         zCol = pTab->aCol[iCol].zName;
       }
-      if( !shortNames && !fullNames ){
-        sqlite3VdbeSetColName(v, i, COLNAME_NAME, 
-            sqlite3DbStrDup(db, pEList->a[i].zSpan), SQLITE_DYNAMIC);
-      }else if( fullNames ){
+      if( fullName ){
         char *zName = 0;
         zName = sqlite3MPrintf(db, "%s.%s", pTab->zName, zCol);
         sqlite3VdbeSetColName(v, i, COLNAME_NAME, zName, SQLITE_DYNAMIC);
@@ -118948,11 +119129,6 @@ static int multiSelect(
       if( dest.eDest!=priorOp ){
         int iCont, iBreak, iStart;
         assert( p->pEList );
-        if( dest.eDest==SRT_Output ){
-          Select *pFirst = p;
-          while( pFirst->pPrior ) pFirst = pFirst->pPrior;
-          generateColumnNames(pParse, pFirst->pSrc, pFirst->pEList);
-        }
         iBreak = sqlite3VdbeMakeLabel(v);
         iCont = sqlite3VdbeMakeLabel(v);
         computeLimitRegisters(pParse, p, iBreak);
@@ -119023,11 +119199,6 @@ static int multiSelect(
       ** tables.
       */
       assert( p->pEList );
-      if( dest.eDest==SRT_Output ){
-        Select *pFirst = p;
-        while( pFirst->pPrior ) pFirst = pFirst->pPrior;
-        generateColumnNames(pParse, pFirst->pSrc, pFirst->pEList);
-      }
       iBreak = sqlite3VdbeMakeLabel(v);
       iCont = sqlite3VdbeMakeLabel(v);
       computeLimitRegisters(pParse, p, iBreak);
@@ -119635,14 +119806,6 @@ static int multiSelectOrderBy(
   */
   sqlite3VdbeResolveLabel(v, labelEnd);
 
-  /* Set the number of output columns
-  */
-  if( pDest->eDest==SRT_Output ){
-    Select *pFirst = pPrior;
-    while( pFirst->pPrior ) pFirst = pFirst->pPrior;
-    generateColumnNames(pParse, pFirst->pSrc, pFirst->pEList);
-  }
-
   /* Reassembly the compound query so that it will be freed correctly
   ** by the calling function */
   if( p->pPrior ){
@@ -119933,7 +120096,6 @@ static int flattenSubquery(
   Select *pSub1;      /* Pointer to the rightmost select in sub-query */
   SrcList *pSrc;      /* The FROM clause of the outer query */
   SrcList *pSubSrc;   /* The FROM clause of the subquery */
-  ExprList *pList;    /* The result set of the outer query */
   int iParent;        /* VDBE cursor number of the pSub result set temp table */
   int iNewParent = -1;/* Replacement table for iParent */
   int isLeftJoin = 0; /* True if pSub is the right side of a LEFT JOIN */    
@@ -120258,14 +120420,6 @@ static int flattenSubquery(
     ** We look at every expression in the outer query and every place we see
     ** "a" we substitute "x*3" and every place we see "b" we substitute "y+10".
     */
-    pList = pParent->pEList;
-    for(i=0; i<pList->nExpr; i++){
-      if( pList->a[i].zName==0 ){
-        char *zName = sqlite3DbStrDup(db, pList->a[i].zSpan);
-        sqlite3Dequote(zName);
-        pList->a[i].zName = zName;
-      }
-    }
     if( pSub->pOrderBy ){
       /* At this point, any non-zero iOrderByCol values indicate that the
       ** ORDER BY column expression is identical to the iOrderByCol'th
@@ -121592,6 +121746,14 @@ SQLITE_PRIVATE int sqlite3Select(
   }
 #endif
 
+  /* Get a pointer the VDBE under construction, allocating a new VDBE if one
+  ** does not already exist */
+  v = sqlite3GetVdbe(pParse);
+  if( v==0 ) goto select_end;
+  if( pDest->eDest==SRT_Output ){
+    generateColumnNames(pParse, p);
+  }
+
   /* Try to flatten subqueries in the FROM clause up into the main query
   */
 #if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
@@ -121627,11 +121789,6 @@ SQLITE_PRIVATE int sqlite3Select(
   }
 #endif
 
-  /* Get a pointer the VDBE under construction, allocating a new VDBE if one
-  ** does not already exist */
-  v = sqlite3GetVdbe(pParse);
-  if( v==0 ) goto select_end;
-
 #ifndef SQLITE_OMIT_COMPOUND_SELECT
   /* Handle compound SELECT statements using the separate multiSelect()
   ** procedure.
@@ -122418,12 +122575,6 @@ SQLITE_PRIVATE int sqlite3Select(
 select_end:
   explainSetInteger(pParse->iSelectId, iRestoreSelectId);
 
-  /* Identify column names if results of the SELECT are to be output.
-  */
-  if( rc==SQLITE_OK && pDest->eDest==SRT_Output ){
-    generateColumnNames(pParse, pTabList, pEList);
-  }
-
   sqlite3DbFree(db, sAggInfo.aCol);
   sqlite3DbFree(db, sAggInfo.aFunc);
 #if SELECTTRACE_ENABLED
@@ -164384,6 +164535,7 @@ struct RtreeGeomCallback {
 ** value to avoid operating on invalid blobs (which could cause a segfault).
 */
 #define RTREE_GEOMETRY_MAGIC 0x891245AB
+#define RTREE_GEOMETRY_SUBTYPE 0x52
 
 /*
 ** An instance of this structure (in the form of a BLOB) is returned by
@@ -165693,7 +165845,11 @@ static int deserializeGeometry(sqlite3_value *pValue, RtreeConstraint *pCons){
   int nExpected;                     /* Expected size of the BLOB */
 
   /* Check that value is actually a blob. */
-  if( sqlite3_value_type(pValue)!=SQLITE_BLOB ) return SQLITE_ERROR;
+  if( sqlite3_value_type(pValue)!=SQLITE_BLOB
+   || sqlite3_value_subtype(pValue)!=RTREE_GEOMETRY_SUBTYPE
+  ){
+    return SQLITE_ERROR;
+  }
 
   /* Check that the blob is roughly the right size. */
   nBlob = sqlite3_value_bytes(pValue);
@@ -167764,6 +167920,7 @@ static void geomCallback(sqlite3_context *ctx, int nArg, sqlite3_value **aArg){
       rtreeMatchArgFree(pBlob);
     }else{
       sqlite3_result_blob(ctx, pBlob, nBlob, rtreeMatchArgFree);
+      sqlite3_result_subtype(ctx, RTREE_GEOMETRY_SUBTYPE);
     }
   }
 }
@@ -199056,7 +199213,7 @@ static void fts5SourceIdFunc(
 ){
   assert( nArg==0 );
   UNUSED_PARAM2(nArg, apUnused);
-  sqlite3_result_text(pCtx, "fts5: 2017-05-25 16:50:27 edb4e819b0c058c7d74d27ebd14cc5ceb2bad6a6144a486a970182b7afe3f8b9", -1, SQLITE_TRANSIENT);
+  sqlite3_result_text(pCtx, "fts5: 2017-08-18 19:28:12 605907e73adb4533b12d22be8422f17a8dc125b5c37bb391756a11fc3a8c4d10", -1, SQLITE_TRANSIENT);
 }
 
 static int fts5Init(sqlite3 *db){
diff --git a/dist/orig/sqlite3.h b/dist/orig/sqlite3.h
index 296ada0..977b05b 100644
--- a/dist/orig/sqlite3.h
+++ b/dist/orig/sqlite3.h
@@ -121,9 +121,9 @@ extern "C" {
 ** [sqlite3_libversion_number()], [sqlite3_sourceid()],
 ** [sqlite_version()] and [sqlite_source_id()].
 */
-#define SQLITE_VERSION        "3.19.2"
-#define SQLITE_VERSION_NUMBER 3019002
-#define SQLITE_SOURCE_ID      "2017-05-25 16:50:27 edb4e819b0c058c7d74d27ebd14cc5ceb2bad6a6144a486a970182b7afe3f8b9"
+#define SQLITE_VERSION        "3.19.4"
+#define SQLITE_VERSION_NUMBER 3019004
+#define SQLITE_SOURCE_ID      "2017-08-18 19:28:12 605907e73adb4533b12d22be8422f17a8dc125b5c37bb391756a11fc3a8c4d10"
 
 /*
 ** CAPI3REF: Run-Time Library Version Numbers
@@ -494,6 +494,9 @@ SQLITE_API int sqlite3_exec(
 #define SQLITE_IOERR_CONVPATH          (SQLITE_IOERR | (26<<8))
 #define SQLITE_IOERR_VNODE             (SQLITE_IOERR | (27<<8))
 #define SQLITE_IOERR_AUTH              (SQLITE_IOERR | (28<<8))
+#define SQLITE_IOERR_BEGIN_ATOMIC      (SQLITE_IOERR | (29<<8))
+#define SQLITE_IOERR_COMMIT_ATOMIC     (SQLITE_IOERR | (30<<8))
+#define SQLITE_IOERR_ROLLBACK_ATOMIC   (SQLITE_IOERR | (31<<8))
 #define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
 #define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
 #define SQLITE_BUSY_SNAPSHOT           (SQLITE_BUSY   |  (2<<8))
@@ -580,6 +583,11 @@ SQLITE_API int sqlite3_exec(
 ** SQLITE_IOCAP_IMMUTABLE flag indicates that the file is on
 ** read-only media and cannot be changed even by processes with
 ** elevated privileges.
+**
+** The SQLITE_IOCAP_BATCH_ATOMIC property means that the underlying
+** filesystem supports doing multiple write operations atomically when those
+** write operations are bracketed by [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] and
+** [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].
 */
 #define SQLITE_IOCAP_ATOMIC                 0x00000001
 #define SQLITE_IOCAP_ATOMIC512              0x00000002
@@ -595,6 +603,7 @@ SQLITE_API int sqlite3_exec(
 #define SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN  0x00000800
 #define SQLITE_IOCAP_POWERSAFE_OVERWRITE    0x00001000
 #define SQLITE_IOCAP_IMMUTABLE              0x00002000
+#define SQLITE_IOCAP_BATCH_ATOMIC           0x00004000
 
 /*
 ** CAPI3REF: File Locking Levels
@@ -729,6 +738,7 @@ struct sqlite3_file {
 ** <li> [SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN]
 ** <li> [SQLITE_IOCAP_POWERSAFE_OVERWRITE]
 ** <li> [SQLITE_IOCAP_IMMUTABLE]
+** <li> [SQLITE_IOCAP_BATCH_ATOMIC]
 ** </ul>
 **
 ** The SQLITE_IOCAP_ATOMIC property means that all writes of
@@ -1012,6 +1022,40 @@ struct sqlite3_io_methods {
 ** The [SQLITE_FCNTL_RBU] opcode is implemented by the special VFS used by
 ** the RBU extension only.  All other VFS should return SQLITE_NOTFOUND for
 ** this opcode.  
+**
+** <li>[[SQLITE_FCNTL_BEGIN_ATOMIC_WRITE]]
+** If the [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] opcode returns SQLITE_OK, then
+** the file descriptor is placed in "batch write mode", which
+** means all subsequent write operations will be deferred and done
+** atomically at the next [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].  Systems
+** that do not support batch atomic writes will return SQLITE_NOTFOUND.
+** ^Following a successful SQLITE_FCNTL_BEGIN_ATOMIC_WRITE and prior to
+** the closing [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] or
+** [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE], SQLite will make
+** no VFS interface calls on the same [sqlite3_file] file descriptor
+** except for calls to the xWrite method and the xFileControl method
+** with [SQLITE_FCNTL_SIZE_HINT].
+**
+** <li>[[SQLITE_FCNTL_COMMIT_ATOMIC_WRITE]]
+** The [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] opcode causes all write
+** operations since the previous successful call to 
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be performed atomically.
+** This file control returns [SQLITE_OK] if and only if the writes were
+** all performed successfully and have been committed to persistent storage.
+** ^Regardless of whether or not it is successful, this file control takes
+** the file descriptor out of batch write mode so that all subsequent
+** write operations are independent.
+** ^SQLite will never invoke SQLITE_FCNTL_COMMIT_ATOMIC_WRITE without
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
+**
+** <li>[[SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE]]
+** The [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE] opcode causes all write
+** operations since the previous successful call to 
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be rolled back.
+** ^This file control takes the file descriptor out of batch write mode
+** so that all subsequent write operations are independent.
+** ^SQLite will never invoke SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE without
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
 ** </ul>
 */
 #define SQLITE_FCNTL_LOCKSTATE               1
@@ -1043,6 +1087,9 @@ struct sqlite3_io_methods {
 #define SQLITE_FCNTL_JOURNAL_POINTER        28
 #define SQLITE_FCNTL_WIN32_GET_HANDLE       29
 #define SQLITE_FCNTL_PDB                    30
+#define SQLITE_FCNTL_BEGIN_ATOMIC_WRITE     31
+#define SQLITE_FCNTL_COMMIT_ATOMIC_WRITE    32
+#define SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE  33
 
 /* deprecated names */
 #define SQLITE_GET_LOCKPROXYFILE      SQLITE_FCNTL_GET_LOCKPROXYFILE
diff --git a/dist/sqlite3.c b/dist/sqlite3.c
index 9db21a8..912acbe 100644
--- a/dist/sqlite3.c
+++ b/dist/sqlite3.c
@@ -1,6 +1,6 @@
 /******************************************************************************
 ** This file is an amalgamation of many separate C source files from SQLite
-** version 3.19.2.  By combining all the individual C code files into this
+** version 3.19.4.  By combining all the individual C code files into this
 ** single large file, the entire code can be compiled as a single translation
 ** unit.  This allows many compilers to do optimizations that would not be
 ** possible if the files were compiled separately.  Performance improvements
@@ -398,9 +398,9 @@ extern "C" {
 ** [sqlite3_libversion_number()], [sqlite3_sourceid()],
 ** [sqlite_version()] and [sqlite_source_id()].
 */
-#define SQLITE_VERSION        "3.19.2"
-#define SQLITE_VERSION_NUMBER 3019002
-#define SQLITE_SOURCE_ID      "2017-05-25 16:50:27 edb4e819b0c058c7d74d27ebd14cc5ceb2bad6a6144a486a970182b7afe3f8b9"
+#define SQLITE_VERSION        "3.19.4"
+#define SQLITE_VERSION_NUMBER 3019004
+#define SQLITE_SOURCE_ID      "2017-08-18 19:28:12 605907e73adb4533b12d22be8422f17a8dc125b5c37bb391756a11fc3a8c4d10"
 
 /*
 ** CAPI3REF: Run-Time Library Version Numbers
@@ -771,6 +771,9 @@ SQLITE_API int sqlite3_exec(
 #define SQLITE_IOERR_CONVPATH          (SQLITE_IOERR | (26<<8))
 #define SQLITE_IOERR_VNODE             (SQLITE_IOERR | (27<<8))
 #define SQLITE_IOERR_AUTH              (SQLITE_IOERR | (28<<8))
+#define SQLITE_IOERR_BEGIN_ATOMIC      (SQLITE_IOERR | (29<<8))
+#define SQLITE_IOERR_COMMIT_ATOMIC     (SQLITE_IOERR | (30<<8))
+#define SQLITE_IOERR_ROLLBACK_ATOMIC   (SQLITE_IOERR | (31<<8))
 #define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
 #define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
 #define SQLITE_BUSY_SNAPSHOT           (SQLITE_BUSY   |  (2<<8))
@@ -857,6 +860,11 @@ SQLITE_API int sqlite3_exec(
 ** SQLITE_IOCAP_IMMUTABLE flag indicates that the file is on
 ** read-only media and cannot be changed even by processes with
 ** elevated privileges.
+**
+** The SQLITE_IOCAP_BATCH_ATOMIC property means that the underlying
+** filesystem supports doing multiple write operations atomically when those
+** write operations are bracketed by [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] and
+** [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].
 */
 #define SQLITE_IOCAP_ATOMIC                 0x00000001
 #define SQLITE_IOCAP_ATOMIC512              0x00000002
@@ -872,6 +880,7 @@ SQLITE_API int sqlite3_exec(
 #define SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN  0x00000800
 #define SQLITE_IOCAP_POWERSAFE_OVERWRITE    0x00001000
 #define SQLITE_IOCAP_IMMUTABLE              0x00002000
+#define SQLITE_IOCAP_BATCH_ATOMIC           0x00004000
 
 /*
 ** CAPI3REF: File Locking Levels
@@ -1006,6 +1015,7 @@ struct sqlite3_file {
 ** <li> [SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN]
 ** <li> [SQLITE_IOCAP_POWERSAFE_OVERWRITE]
 ** <li> [SQLITE_IOCAP_IMMUTABLE]
+** <li> [SQLITE_IOCAP_BATCH_ATOMIC]
 ** </ul>
 **
 ** The SQLITE_IOCAP_ATOMIC property means that all writes of
@@ -1289,6 +1299,40 @@ struct sqlite3_io_methods {
 ** The [SQLITE_FCNTL_RBU] opcode is implemented by the special VFS used by
 ** the RBU extension only.  All other VFS should return SQLITE_NOTFOUND for
 ** this opcode.  
+**
+** <li>[[SQLITE_FCNTL_BEGIN_ATOMIC_WRITE]]
+** If the [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] opcode returns SQLITE_OK, then
+** the file descriptor is placed in "batch write mode", which
+** means all subsequent write operations will be deferred and done
+** atomically at the next [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].  Systems
+** that do not support batch atomic writes will return SQLITE_NOTFOUND.
+** ^Following a successful SQLITE_FCNTL_BEGIN_ATOMIC_WRITE and prior to
+** the closing [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] or
+** [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE], SQLite will make
+** no VFS interface calls on the same [sqlite3_file] file descriptor
+** except for calls to the xWrite method and the xFileControl method
+** with [SQLITE_FCNTL_SIZE_HINT].
+**
+** <li>[[SQLITE_FCNTL_COMMIT_ATOMIC_WRITE]]
+** The [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] opcode causes all write
+** operations since the previous successful call to 
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be performed atomically.
+** This file control returns [SQLITE_OK] if and only if the writes were
+** all performed successfully and have been committed to persistent storage.
+** ^Regardless of whether or not it is successful, this file control takes
+** the file descriptor out of batch write mode so that all subsequent
+** write operations are independent.
+** ^SQLite will never invoke SQLITE_FCNTL_COMMIT_ATOMIC_WRITE without
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
+**
+** <li>[[SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE]]
+** The [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE] opcode causes all write
+** operations since the previous successful call to 
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be rolled back.
+** ^This file control takes the file descriptor out of batch write mode
+** so that all subsequent write operations are independent.
+** ^SQLite will never invoke SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE without
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
 ** </ul>
 */
 #define SQLITE_FCNTL_LOCKSTATE               1
@@ -1320,6 +1364,9 @@ struct sqlite3_io_methods {
 #define SQLITE_FCNTL_JOURNAL_POINTER        28
 #define SQLITE_FCNTL_WIN32_GET_HANDLE       29
 #define SQLITE_FCNTL_PDB                    30
+#define SQLITE_FCNTL_BEGIN_ATOMIC_WRITE     31
+#define SQLITE_FCNTL_COMMIT_ATOMIC_WRITE    32
+#define SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE  33
 
 /* deprecated names */
 #define SQLITE_GET_LOCKPROXYFILE      SQLITE_FCNTL_GET_LOCKPROXYFILE
@@ -11721,6 +11768,15 @@ SQLITE_PRIVATE void sqlite3HashClear(Hash*);
 #endif
 
 /*
+** The compile-time options SQLITE_MMAP_READWRITE and 
+** SQLITE_ENABLE_BATCH_ATOMIC_WRITE are not compatible with one another.
+** You must choose one or the other (or neither) but not both.
+*/
+#if defined(SQLITE_MMAP_READWRITE) && defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+#error Cannot use both SQLITE_MMAP_READWRITE and SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+#endif
+
+/*
 ** GCC does not define the offsetof() macro so we'll have to do it
 ** ourselves.
 */
@@ -17036,7 +17092,8 @@ SQLITE_PRIVATE int sqlite3FindInIndex(Parse *, Expr *, u32, int*, int*);
 
 SQLITE_PRIVATE int sqlite3JournalOpen(sqlite3_vfs *, const char *, sqlite3_file *, int, int);
 SQLITE_PRIVATE int sqlite3JournalSize(sqlite3_vfs *);
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
 SQLITE_PRIVATE   int sqlite3JournalCreate(sqlite3_file *);
 #endif
 
@@ -17540,6 +17597,9 @@ static const char * const azCompileOpt[] = {
 #if SQLITE_ENABLE_ATOMIC_WRITE
   "ENABLE_ATOMIC_WRITE",
 #endif
+#if SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+  "ENABLE_BATCH_ATOMIC_WRITE",
+#endif
 #if SQLITE_ENABLE_CEROD
   "ENABLE_CEROD",
 #endif
@@ -29775,6 +29835,7 @@ SQLITE_PRIVATE const char *sqlite3OpcodeName(int i){
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <sys/ioctl.h>
 #include <unistd.h>
 /* #include <time.h> */
 #include <sys/time.h>
@@ -29784,7 +29845,7 @@ SQLITE_PRIVATE const char *sqlite3OpcodeName(int i){
 #endif
 
 #if SQLITE_ENABLE_LOCKING_STYLE
-# include <sys/ioctl.h>
+/* # include <sys/ioctl.h> */
 # include <sys/file.h>
 # include <sys/param.h>
 #endif /* SQLITE_ENABLE_LOCKING_STYLE */
@@ -29905,10 +29966,8 @@ struct unixFile {
   sqlite3_int64 mmapSizeMax;          /* Configured FCNTL_MMAP_SIZE value */
   void *pMapRegion;                   /* Memory mapped region */
 #endif
-#ifdef __QNXNTO__
   int sectorSize;                     /* Device sector size */
   int deviceCharacteristics;          /* Precomputed device characteristics */
-#endif
 #if SQLITE_ENABLE_LOCKING_STYLE
   int openFlags;                      /* The flags specified at open() */
 #endif
@@ -30211,6 +30270,20 @@ SQLITE_API extern int sqlite3_open_file_count;
 # define lseek lseek64
 #endif
 
+#ifdef __linux__
+/*
+** Linux-specific IOCTL magic numbers used for controlling F2FS
+*/
+#define F2FS_IOCTL_MAGIC        0xf5
+#define F2FS_IOC_START_ATOMIC_WRITE     _IO(F2FS_IOCTL_MAGIC, 1)
+#define F2FS_IOC_COMMIT_ATOMIC_WRITE    _IO(F2FS_IOCTL_MAGIC, 2)
+#define F2FS_IOC_START_VOLATILE_WRITE   _IO(F2FS_IOCTL_MAGIC, 3)
+#define F2FS_IOC_ABORT_VOLATILE_WRITE   _IO(F2FS_IOCTL_MAGIC, 5)
+#define F2FS_IOC_GET_FEATURES           _IOR(F2FS_IOCTL_MAGIC, 12, u32)
+#define F2FS_FEATURE_ATOMIC_WRITE 0x0004
+#endif /* __linux__ */
+
+
 /*
 ** Different Unix systems declare open() in different ways.  Same use
 ** open(const char*,int,mode_t).  Others use open(const char*,int,...).
@@ -30383,6 +30456,9 @@ static struct unix_syscall {
 #endif
 #define osLstat      ((int(*)(const char*,struct stat*))aSyscall[27].pCurrent)
 
+  { "ioctl",         (sqlite3_syscall_ptr)ioctl,          0 },
+#define osIoctl ((int(*)(int,int,...))aSyscall[28].pCurrent)
+
 }; /* End of the overrideable system calls */
 
 
@@ -33660,6 +33736,21 @@ static int unixGetTempname(int nBuf, char *zBuf);
 static int unixFileControl(sqlite3_file *id, int op, void *pArg){
   unixFile *pFile = (unixFile*)id;
   switch( op ){
+#if defined(__linux__) && defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+    case SQLITE_FCNTL_BEGIN_ATOMIC_WRITE: {
+      int rc = osIoctl(pFile->h, F2FS_IOC_START_ATOMIC_WRITE);
+      return rc ? SQLITE_IOERR_BEGIN_ATOMIC : SQLITE_OK;
+    }
+    case SQLITE_FCNTL_COMMIT_ATOMIC_WRITE: {
+      int rc = osIoctl(pFile->h, F2FS_IOC_COMMIT_ATOMIC_WRITE);
+      return rc ? SQLITE_IOERR_COMMIT_ATOMIC : SQLITE_OK;
+    }
+    case SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE: {
+      int rc = osIoctl(pFile->h, F2FS_IOC_ABORT_VOLATILE_WRITE);
+      return rc ? SQLITE_IOERR_ROLLBACK_ATOMIC : SQLITE_OK;
+    }
+#endif /* __linux__ && SQLITE_ENABLE_BATCH_ATOMIC_WRITE */
+
     case SQLITE_FCNTL_LOCKSTATE: {
       *(int*)pArg = pFile->eFileLock;
       return SQLITE_OK;
@@ -33743,30 +33834,41 @@ static int unixFileControl(sqlite3_file *id, int op, void *pArg){
 }
 
 /*
-** Return the sector size in bytes of the underlying block device for
-** the specified file. This is almost always 512 bytes, but may be
-** larger for some devices.
+** If pFd->sectorSize is non-zero when this function is called, it is a
+** no-op. Otherwise, the values of pFd->sectorSize and 
+** pFd->deviceCharacteristics are set according to the file-system 
+** characteristics. 
 **
-** SQLite code assumes this function cannot fail. It also assumes that
-** if two files are created in the same file-system directory (i.e.
-** a database and its journal file) that the sector size will be the
-** same for both.
+** There are two versions of this function. One for QNX and one for all
+** other systems.
 */
-#ifndef __QNXNTO__ 
-static int unixSectorSize(sqlite3_file *NotUsed){
-  UNUSED_PARAMETER(NotUsed);
-  return SQLITE_DEFAULT_SECTOR_SIZE;
-}
-#endif
+#ifndef __QNXNTO__
+static void setDeviceCharacteristics(unixFile *pFd){
+  assert( pFd->deviceCharacteristics==0 || pFd->sectorSize!=0 );
+  if( pFd->sectorSize==0 ){
+#if defined(__linux__) && defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+    int res;
+    u32 f = 0;
 
-/*
-** The following version of unixSectorSize() is optimized for QNX.
-*/
-#ifdef __QNXNTO__
+    /* Check for support for F2FS atomic batch writes. */
+    res = osIoctl(pFd->h, F2FS_IOC_GET_FEATURES, &f);
+    if( res==0 && (f & F2FS_FEATURE_ATOMIC_WRITE) ){
+      pFd->deviceCharacteristics = SQLITE_IOCAP_BATCH_ATOMIC;
+    }
+#endif /* __linux__ && SQLITE_ENABLE_BATCH_ATOMIC_WRITE */
+
+    /* Set the POWERSAFE_OVERWRITE flag if requested. */
+    if( pFd->ctrlFlags & UNIXFILE_PSOW ){
+      pFd->deviceCharacteristics |= SQLITE_IOCAP_POWERSAFE_OVERWRITE;
+    }
+
+    pFd->sectorSize = SQLITE_DEFAULT_SECTOR_SIZE;
+  }
+}
+#else
 #include <sys/dcmd_blk.h>
 #include <sys/statvfs.h>
-static int unixSectorSize(sqlite3_file *id){
-  unixFile *pFile = (unixFile*)id;
+static void setDeviceCharacteristics(unixFile *pFile){
   if( pFile->sectorSize == 0 ){
     struct statvfs fsInfo;
        
@@ -33835,9 +33937,24 @@ static int unixSectorSize(sqlite3_file *id){
     pFile->deviceCharacteristics = 0;
     pFile->sectorSize = SQLITE_DEFAULT_SECTOR_SIZE;
   }
-  return pFile->sectorSize;
 }
-#endif /* __QNXNTO__ */
+#endif
+
+/*
+** Return the sector size in bytes of the underlying block device for
+** the specified file. This is almost always 512 bytes, but may be
+** larger for some devices.
+**
+** SQLite code assumes this function cannot fail. It also assumes that
+** if two files are created in the same file-system directory (i.e.
+** a database and its journal file) that the sector size will be the
+** same for both.
+*/
+static int unixSectorSize(sqlite3_file *id){
+  unixFile *pFd = (unixFile*)id;
+  setDeviceCharacteristics(pFd);
+  return pFd->sectorSize;
+}
 
 /*
 ** Return the device characteristics for the file.
@@ -33853,16 +33970,9 @@ static int unixSectorSize(sqlite3_file *id){
 ** available to turn it off and URI query parameter available to turn it off.
 */
 static int unixDeviceCharacteristics(sqlite3_file *id){
-  unixFile *p = (unixFile*)id;
-  int rc = 0;
-#ifdef __QNXNTO__
-  if( p->sectorSize==0 ) unixSectorSize(id);
-  rc = p->deviceCharacteristics;
-#endif
-  if( p->ctrlFlags & UNIXFILE_PSOW ){
-    rc |= SQLITE_IOCAP_POWERSAFE_OVERWRITE;
-  }
-  return rc;
+  unixFile *pFd = (unixFile*)id;
+  setDeviceCharacteristics(pFd);
+  return pFd->deviceCharacteristics;
 }
 
 #if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0
@@ -37481,7 +37591,7 @@ SQLITE_API int sqlite3_os_init(void){
 
   /* Double-check that the aSyscall[] array has been constructed
   ** correctly.  See ticket [bb3a86e890c8e96ab] */
-  assert( ArraySize(aSyscall)==28 );
+  assert( ArraySize(aSyscall)==29 );
 
   /* Register all VFSes defined in the aVfs[] array */
   for(i=0; i<(sizeof(aVfs)/sizeof(sqlite3_vfs)); i++){
@@ -47864,6 +47974,7 @@ static int assert_pager_state(Pager *p){
       assert( isOpen(p->jfd) 
            || p->journalMode==PAGER_JOURNALMODE_OFF 
            || p->journalMode==PAGER_JOURNALMODE_WAL 
+           || (sqlite3OsDeviceCharacteristics(p->fd)&SQLITE_IOCAP_BATCH_ATOMIC)
       );
       assert( pPager->dbOrigSize<=pPager->dbHintSize );
       break;
@@ -47875,6 +47986,7 @@ static int assert_pager_state(Pager *p){
       assert( isOpen(p->jfd) 
            || p->journalMode==PAGER_JOURNALMODE_OFF 
            || p->journalMode==PAGER_JOURNALMODE_WAL 
+           || (sqlite3OsDeviceCharacteristics(p->fd)&SQLITE_IOCAP_BATCH_ATOMIC)
       );
       break;
 
@@ -48085,34 +48197,45 @@ static int pagerLockDb(Pager *pPager, int eLock){
 }
 
 /*
-** This function determines whether or not the atomic-write optimization
-** can be used with this pager. The optimization can be used if:
+** This function determines whether or not the atomic-write or
+** atomic-batch-write optimizations can be used with this pager. The
+** atomic-write optimization can be used if:
 **
 **  (a) the value returned by OsDeviceCharacteristics() indicates that
 **      a database page may be written atomically, and
 **  (b) the value returned by OsSectorSize() is less than or equal
 **      to the page size.
 **
-** The optimization is also always enabled for temporary files. It is
-** an error to call this function if pPager is opened on an in-memory
-** database.
+** If it can be used, then the value returned is the size of the journal 
+** file when it contains rollback data for exactly one page.
 **
-** If the optimization cannot be used, 0 is returned. If it can be used,
-** then the value returned is the size of the journal file when it
-** contains rollback data for exactly one page.
+** The atomic-batch-write optimization can be used if OsDeviceCharacteristics()
+** returns a value with the SQLITE_IOCAP_BATCH_ATOMIC bit set. -1 is
+** returned in this case.
+**
+** If neither optimization can be used, 0 is returned.
 */
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
 static int jrnlBufferSize(Pager *pPager){
   assert( !MEMDB );
-  if( !pPager->tempFile ){
-    int dc;                           /* Device characteristics */
-    int nSector;                      /* Sector size */
-    int szPage;                       /* Page size */
 
-    assert( isOpen(pPager->fd) );
-    dc = sqlite3OsDeviceCharacteristics(pPager->fd);
-    nSector = pPager->sectorSize;
-    szPage = pPager->pageSize;
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+  int dc;                           /* Device characteristics */
+
+  assert( isOpen(pPager->fd) );
+  dc = sqlite3OsDeviceCharacteristics(pPager->fd);
+#endif
+
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+  if( dc&SQLITE_IOCAP_BATCH_ATOMIC ){
+    return -1;
+  }
+#endif
+
+#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+  {
+    int nSector = pPager->sectorSize;
+    int szPage = pPager->pageSize;
 
     assert(SQLITE_IOCAP_ATOMIC512==(512>>8));
     assert(SQLITE_IOCAP_ATOMIC64K==(65536>>8));
@@ -48122,11 +48245,11 @@ static int jrnlBufferSize(Pager *pPager){
   }
 
   return JOURNAL_HDR_SZ(pPager) + JOURNAL_PG_SZ(pPager);
-}
-#else
-# define jrnlBufferSize(x) 0
 #endif
 
+  return 0;
+}
+
 /*
 ** If SQLITE_CHECK_PAGES is defined then we do some sanity checking
 ** on the cache using a hash function.  This is used for testing
@@ -48929,7 +49052,9 @@ static int pager_end_transaction(Pager *pPager, int hasMaster, int bCommit){
   }
 
   releaseAllSavepoints(pPager);
-  assert( isOpen(pPager->jfd) || pPager->pInJournal==0 );
+  assert( isOpen(pPager->jfd) || pPager->pInJournal==0 
+      || (sqlite3OsDeviceCharacteristics(pPager->fd)&SQLITE_IOCAP_BATCH_ATOMIC)
+  );
   if( isOpen(pPager->jfd) ){
     assert( !pagerUseWal(pPager) );
 
@@ -51486,6 +51611,13 @@ static int pagerStress(void *p, PgHdr *pPg){
       rc = pagerWalFrames(pPager, pPg, 0, 0);
     }
   }else{
+    
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+    if( pPager->tempFile==0 ){
+      rc = sqlite3JournalCreate(pPager->jfd);
+      if( rc!=SQLITE_OK ) return pager_error(pPager, rc);
+    }
+#endif
   
     /* Sync the journal file if required. */
     if( pPg->flags&PGHDR_NEED_SYNC 
@@ -53271,6 +53403,21 @@ SQLITE_PRIVATE int sqlite3PagerCommitPhaseOne(
         sqlite3PcacheCleanAll(pPager->pPCache);
       }
     }else{
+      /* The bBatch boolean is true if the batch-atomic-write commit method
+      ** should be used.  No rollback journal is created if batch-atomic-write
+      ** is enabled.
+      */
+      sqlite3_file *fd = pPager->fd;
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+      const int bBatch = zMaster==0    /* An SQLITE_IOCAP_BATCH_ATOMIC commit */
+        && (sqlite3OsDeviceCharacteristics(fd) & SQLITE_IOCAP_BATCH_ATOMIC)
+        && !pPager->noSync
+        && sqlite3JournalIsInMemory(pPager->jfd);
+#else
+# define bBatch 0
+#endif
+
+#ifdef SQLITE_ENABLE_ATOMIC_WRITE
       /* The following block updates the change-counter. Exactly how it
       ** does this depends on whether or not the atomic-update optimization
       ** was enabled at compile time, and if this transaction meets the 
@@ -53294,33 +53441,40 @@ SQLITE_PRIVATE int sqlite3PagerCommitPhaseOne(
       ** in 'direct' mode. In this case the journal file will never be
       ** created for this transaction.
       */
-  #ifdef SQLITE_ENABLE_ATOMIC_WRITE
-      PgHdr *pPg;
-      assert( isOpen(pPager->jfd) 
-           || pPager->journalMode==PAGER_JOURNALMODE_OFF 
-           || pPager->journalMode==PAGER_JOURNALMODE_WAL 
-      );
-      if( !zMaster && isOpen(pPager->jfd) 
-       && pPager->journalOff==jrnlBufferSize(pPager) 
-       && pPager->dbSize>=pPager->dbOrigSize
-       && (0==(pPg = sqlite3PcacheDirtyList(pPager->pPCache)) || 0==pPg->pDirty)
-      ){
-        /* Update the db file change counter via the direct-write method. The 
-        ** following call will modify the in-memory representation of page 1 
-        ** to include the updated change counter and then write page 1 
-        ** directly to the database file. Because of the atomic-write 
-        ** property of the host file-system, this is safe.
-        */
-        rc = pager_incr_changecounter(pPager, 1);
-      }else{
-        rc = sqlite3JournalCreate(pPager->jfd);
-        if( rc==SQLITE_OK ){
-          rc = pager_incr_changecounter(pPager, 0);
+      if( bBatch==0 ){
+        PgHdr *pPg;
+        assert( isOpen(pPager->jfd) 
+            || pPager->journalMode==PAGER_JOURNALMODE_OFF 
+            || pPager->journalMode==PAGER_JOURNALMODE_WAL 
+            );
+        if( !zMaster && isOpen(pPager->jfd) 
+         && pPager->journalOff==jrnlBufferSize(pPager) 
+         && pPager->dbSize>=pPager->dbOrigSize
+         && (!(pPg = sqlite3PcacheDirtyList(pPager->pPCache)) || 0==pPg->pDirty)
+        ){
+          /* Update the db file change counter via the direct-write method. The 
+          ** following call will modify the in-memory representation of page 1 
+          ** to include the updated change counter and then write page 1 
+          ** directly to the database file. Because of the atomic-write 
+          ** property of the host file-system, this is safe.
+          */
+          rc = pager_incr_changecounter(pPager, 1);
+        }else{
+          rc = sqlite3JournalCreate(pPager->jfd);
+          if( rc==SQLITE_OK ){
+            rc = pager_incr_changecounter(pPager, 0);
+          }
         }
       }
-  #else
+#else 
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+      if( zMaster ){
+        rc = sqlite3JournalCreate(pPager->jfd);
+        if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
+      }
+#endif
       rc = pager_incr_changecounter(pPager, 0);
-  #endif
+#endif
       if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
   
       /* Write the master journal name into the journal file. If a master 
@@ -53343,8 +53497,24 @@ SQLITE_PRIVATE int sqlite3PagerCommitPhaseOne(
       */
       rc = syncJournal(pPager, 0);
       if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
-  
+
+      if( bBatch ){
+        /* The pager is now in DBMOD state. But regardless of what happens
+        ** next, attempting to play the journal back into the database would
+        ** be unsafe. Close it now to make sure that does not happen.  */
+        sqlite3OsClose(pPager->jfd);
+        rc = sqlite3OsFileControl(fd, SQLITE_FCNTL_BEGIN_ATOMIC_WRITE, 0);
+        if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
+      }
       rc = pager_write_pagelist(pPager,sqlite3PcacheDirtyList(pPager->pPCache));
+      if( bBatch ){
+        if( rc==SQLITE_OK ){
+          rc = sqlite3OsFileControl(fd, SQLITE_FCNTL_COMMIT_ATOMIC_WRITE, 0);
+        }else{
+          sqlite3OsFileControl(fd, SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE, 0);
+        }
+      }
+
       if( rc!=SQLITE_OK ){
         assert( rc!=SQLITE_IOERR_BLOCKED );
         goto commit_phase_one_exit;
@@ -67208,12 +67378,18 @@ SQLITE_PRIVATE int sqlite3BtreeInsert(
       memcpy(newCell, oldCell, 4);
     }
     rc = clearCell(pPage, oldCell, &info);
-    if( info.nSize==szNew && info.nLocal==info.nPayload ){
+    if( info.nSize==szNew && info.nLocal==info.nPayload 
+     && (!ISAUTOVACUUM || szNew<pPage->minLocal)
+    ){
       /* Overwrite the old cell with the new if they are the same size.
       ** We could also try to do this if the old cell is smaller, then add
       ** the leftover space to the free list.  But experiments show that
       ** doing that is no faster then skipping this optimization and just
-      ** calling dropCell() and insertCell(). */
+      ** calling dropCell() and insertCell(). 
+      **
+      ** This optimization cannot be used on an autovacuum database if the
+      ** new entry uses overflow pages, as the insertCell() call below is
+      ** necessary to add the PTRMAP_OVERFLOW1 pointer-map entry.  */
       assert( rc==SQLITE_OK ); /* clearCell never fails when nLocal==nPayload */
       if( oldCell+szNew > pPage->aDataEnd ) return SQLITE_CORRUPT_BKPT;
       memcpy(oldCell, newCell, szNew);
@@ -88855,7 +89031,8 @@ static int memjrnlRead(
   int iChunkOffset;
   FileChunk *pChunk;
 
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
   if( (iAmt+iOfst)>p->endpoint.iOffset ){
     return SQLITE_IOERR_SHORT_READ;
   }
@@ -88974,7 +89151,8 @@ static int memjrnlWrite(
     ** atomic-write optimization. In this case the first 28 bytes of the
     ** journal file may be written as part of committing the transaction. */ 
     assert( iOfst==p->endpoint.iOffset || iOfst==0 );
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
     if( iOfst==0 && p->pFirst ){
       assert( p->nChunkSize>iAmt );
       memcpy((u8*)p->pFirst->zChunk, zBuf, iAmt);
@@ -89143,17 +89321,31 @@ SQLITE_PRIVATE void sqlite3MemJournalOpen(sqlite3_file *pJfd){
   sqlite3JournalOpen(0, 0, pJfd, 0, -1);
 }
 
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
 /*
 ** If the argument p points to a MemJournal structure that is not an 
 ** in-memory-only journal file (i.e. is one that was opened with a +ve
-** nSpill parameter), and the underlying file has not yet been created, 
-** create it now.
+** nSpill parameter or as SQLITE_OPEN_MAIN_JOURNAL), and the underlying 
+** file has not yet been created, create it now.
 */
-SQLITE_PRIVATE int sqlite3JournalCreate(sqlite3_file *p){
+SQLITE_PRIVATE int sqlite3JournalCreate(sqlite3_file *pJfd){
   int rc = SQLITE_OK;
-  if( p->pMethods==&MemJournalMethods && ((MemJournal*)p)->nSpill>0 ){
-    rc = memjrnlCreateFile((MemJournal*)p);
+  MemJournal *p = (MemJournal*)pJfd;
+  if( p->pMethod==&MemJournalMethods && (
+#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+     p->nSpill>0
+#else
+     /* While this appears to not be possible without ATOMIC_WRITE, the
+     ** paths are complex, so it seems prudent to leave the test in as
+     ** a NEVER(), in case our analysis is subtly flawed. */
+     NEVER(p->nSpill>0)
+#endif
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+     || (p->flags & SQLITE_OPEN_MAIN_JOURNAL)
+#endif
+  )){
+    rc = memjrnlCreateFile(p);
   }
   return rc;
 }
@@ -101424,15 +101616,6 @@ static void convertToWithoutRowidTable(Parse *pParse, Table *pTab){
   }else{
     pPk = sqlite3PrimaryKeyIndex(pTab);
 
-    /* Bypass the creation of the PRIMARY KEY btree and the sqlite_master
-    ** table entry. This is only required if currently generating VDBE
-    ** code for a CREATE TABLE (not when parsing one as part of reading
-    ** a database schema).  */
-    if( v ){
-      assert( db->init.busy==0 );
-      sqlite3VdbeChangeOpcode(v, pPk->tnum, OP_Goto);
-    }
-
     /*
     ** Remove all redundant columns from the PRIMARY KEY.  For example, change
     ** "PRIMARY KEY(a,b,a,b,c,b,c,d)" into just "PRIMARY KEY(a,b,c,d)".  Later
@@ -101452,6 +101635,15 @@ static void convertToWithoutRowidTable(Parse *pParse, Table *pTab){
   if( !db->init.imposterTable ) pPk->uniqNotNull = 1;
   nPk = pPk->nKeyCol;
 
+  /* Bypass the creation of the PRIMARY KEY btree and the sqlite_master
+  ** table entry. This is only required if currently generating VDBE
+  ** code for a CREATE TABLE (not when parsing one as part of reading
+  ** a database schema).  */
+  if( v && pPk->tnum>0 ){
+    assert( db->init.busy==0 );
+    sqlite3VdbeChangeOpcode(v, pPk->tnum, OP_Goto);
+  }
+
   /* The root page of the PRIMARY KEY is the table root page */
   pPk->tnum = pTab->tnum;
 
@@ -117953,13 +118145,10 @@ static const char *columnTypeImpl(
         ** of the SELECT statement. Return the declaration type and origin
         ** data for the result-set column of the sub-select.
         */
-        if( iCol>=0 && ALWAYS(iCol<pS->pEList->nExpr) ){
+        if( iCol>=0 && iCol<pS->pEList->nExpr ){
           /* If iCol is less than zero, then the expression requests the
           ** rowid of the sub-select or view. This expression is legal (see 
           ** test case misc2.2.2) - it always evaluates to NULL.
-          **
-          ** The ALWAYS() is because iCol>=pS->pEList->nExpr will have been
-          ** caught already by name resolution.
           */
           NameContext sNC;
           Expr *p = pS->pEList->a[iCol].pExpr;
@@ -118069,18 +118258,6 @@ static void generateColumnTypes(
 #endif /* !defined(SQLITE_OMIT_DECLTYPE) */
 }
 
-/*
-** Return the Table objecct in the SrcList that has cursor iCursor.
-** Or return NULL if no such Table object exists in the SrcList.
-*/
-static Table *tableWithCursor(SrcList *pList, int iCursor){
-  int j;
-  for(j=0; j<pList->nSrc; j++){
-    if( pList->a[j].iCursor==iCursor ) return pList->a[j].pTab;
-  }
-  return 0;
-}
-
 
 /*
 ** Generate code that will tell the VDBE the names of columns
@@ -118089,14 +118266,16 @@ static Table *tableWithCursor(SrcList *pList, int iCursor){
 */
 static void generateColumnNames(
   Parse *pParse,      /* Parser context */
-  SrcList *pTabList,  /* List of tables */
-  ExprList *pEList    /* Expressions defining the result set */
+  Select *pSelect     /* Generate column names for this SELECT statement */
 ){
   Vdbe *v = pParse->pVdbe;
   int i;
   Table *pTab;
+  SrcList *pTabList;
+  ExprList *pEList;
   sqlite3 *db = pParse->db;
-  int fullNames, shortNames;
+  int fullName;    /* TABLE.COLUMN if no AS clause and is a direct table ref */
+  int srcName;     /* COLUMN or TABLE.COLUMN if no AS clause and is direct */
 
 #ifndef SQLITE_OMIT_EXPLAIN
   /* If this is an EXPLAIN, skip this step */
@@ -118106,24 +118285,29 @@ static void generateColumnNames(
 #endif
 
   if( pParse->colNamesSet || db->mallocFailed ) return;
+  /* Column names are determined by the left-most term of a compound select */
+  while( pSelect->pPrior ) pSelect = pSelect->pPrior;
+  pTabList = pSelect->pSrc;
+  pEList = pSelect->pEList;
   assert( v!=0 );
   assert( pTabList!=0 );
   pParse->colNamesSet = 1;
-  fullNames = (db->flags & SQLITE_FullColNames)!=0;
-  shortNames = (db->flags & SQLITE_ShortColNames)!=0;
+  fullName = (db->flags & SQLITE_FullColNames)!=0;
+  srcName = (db->flags & SQLITE_ShortColNames)!=0 || fullName;
   sqlite3VdbeSetNumCols(v, pEList->nExpr);
   for(i=0; i<pEList->nExpr; i++){
-    Expr *p;
-    p = pEList->a[i].pExpr;
-    if( NEVER(p==0) ) continue;
+    Expr *p = pEList->a[i].pExpr;
+
+    assert( p!=0 );
     if( pEList->a[i].zName ){
+      /* An AS clause always takes first priority */
       char *zName = pEList->a[i].zName;
       sqlite3VdbeSetColName(v, i, COLNAME_NAME, zName, SQLITE_TRANSIENT);
-    }else if( (p->op==TK_COLUMN || p->op==TK_AGG_COLUMN)
-           && (pTab = tableWithCursor(pTabList, p->iTable))!=0
-    ){
+    }else if( srcName && p->op==TK_COLUMN ){
       char *zCol;
       int iCol = p->iColumn;
+      pTab = p->pTab;
+      assert( pTab!=0 );
       if( iCol<0 ) iCol = pTab->iPKey;
       assert( iCol==-1 || (iCol>=0 && iCol<pTab->nCol) );
       if( iCol<0 ){
@@ -118131,10 +118315,7 @@ static void generateColumnNames(
       }else{
         zCol = pTab->aCol[iCol].zName;
       }
-      if( !shortNames && !fullNames ){
-        sqlite3VdbeSetColName(v, i, COLNAME_NAME, 
-            sqlite3DbStrDup(db, pEList->a[i].zSpan), SQLITE_DYNAMIC);
-      }else if( fullNames ){
+      if( fullName ){
         char *zName = 0;
         zName = sqlite3MPrintf(db, "%s.%s", pTab->zName, zCol);
         sqlite3VdbeSetColName(v, i, COLNAME_NAME, zName, SQLITE_DYNAMIC);
@@ -118948,11 +119129,6 @@ static int multiSelect(
       if( dest.eDest!=priorOp ){
         int iCont, iBreak, iStart;
         assert( p->pEList );
-        if( dest.eDest==SRT_Output ){
-          Select *pFirst = p;
-          while( pFirst->pPrior ) pFirst = pFirst->pPrior;
-          generateColumnNames(pParse, pFirst->pSrc, pFirst->pEList);
-        }
         iBreak = sqlite3VdbeMakeLabel(v);
         iCont = sqlite3VdbeMakeLabel(v);
         computeLimitRegisters(pParse, p, iBreak);
@@ -119023,11 +119199,6 @@ static int multiSelect(
       ** tables.
       */
       assert( p->pEList );
-      if( dest.eDest==SRT_Output ){
-        Select *pFirst = p;
-        while( pFirst->pPrior ) pFirst = pFirst->pPrior;
-        generateColumnNames(pParse, pFirst->pSrc, pFirst->pEList);
-      }
       iBreak = sqlite3VdbeMakeLabel(v);
       iCont = sqlite3VdbeMakeLabel(v);
       computeLimitRegisters(pParse, p, iBreak);
@@ -119635,14 +119806,6 @@ static int multiSelectOrderBy(
   */
   sqlite3VdbeResolveLabel(v, labelEnd);
 
-  /* Set the number of output columns
-  */
-  if( pDest->eDest==SRT_Output ){
-    Select *pFirst = pPrior;
-    while( pFirst->pPrior ) pFirst = pFirst->pPrior;
-    generateColumnNames(pParse, pFirst->pSrc, pFirst->pEList);
-  }
-
   /* Reassembly the compound query so that it will be freed correctly
   ** by the calling function */
   if( p->pPrior ){
@@ -119933,7 +120096,6 @@ static int flattenSubquery(
   Select *pSub1;      /* Pointer to the rightmost select in sub-query */
   SrcList *pSrc;      /* The FROM clause of the outer query */
   SrcList *pSubSrc;   /* The FROM clause of the subquery */
-  ExprList *pList;    /* The result set of the outer query */
   int iParent;        /* VDBE cursor number of the pSub result set temp table */
   int iNewParent = -1;/* Replacement table for iParent */
   int isLeftJoin = 0; /* True if pSub is the right side of a LEFT JOIN */    
@@ -120258,14 +120420,6 @@ static int flattenSubquery(
     ** We look at every expression in the outer query and every place we see
     ** "a" we substitute "x*3" and every place we see "b" we substitute "y+10".
     */
-    pList = pParent->pEList;
-    for(i=0; i<pList->nExpr; i++){
-      if( pList->a[i].zName==0 ){
-        char *zName = sqlite3DbStrDup(db, pList->a[i].zSpan);
-        sqlite3Dequote(zName);
-        pList->a[i].zName = zName;
-      }
-    }
     if( pSub->pOrderBy ){
       /* At this point, any non-zero iOrderByCol values indicate that the
       ** ORDER BY column expression is identical to the iOrderByCol'th
@@ -121592,6 +121746,14 @@ SQLITE_PRIVATE int sqlite3Select(
   }
 #endif
 
+  /* Get a pointer the VDBE under construction, allocating a new VDBE if one
+  ** does not already exist */
+  v = sqlite3GetVdbe(pParse);
+  if( v==0 ) goto select_end;
+  if( pDest->eDest==SRT_Output ){
+    generateColumnNames(pParse, p);
+  }
+
   /* Try to flatten subqueries in the FROM clause up into the main query
   */
 #if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
@@ -121627,11 +121789,6 @@ SQLITE_PRIVATE int sqlite3Select(
   }
 #endif
 
-  /* Get a pointer the VDBE under construction, allocating a new VDBE if one
-  ** does not already exist */
-  v = sqlite3GetVdbe(pParse);
-  if( v==0 ) goto select_end;
-
 #ifndef SQLITE_OMIT_COMPOUND_SELECT
   /* Handle compound SELECT statements using the separate multiSelect()
   ** procedure.
@@ -122418,12 +122575,6 @@ SQLITE_PRIVATE int sqlite3Select(
 select_end:
   explainSetInteger(pParse->iSelectId, iRestoreSelectId);
 
-  /* Identify column names if results of the SELECT are to be output.
-  */
-  if( rc==SQLITE_OK && pDest->eDest==SRT_Output ){
-    generateColumnNames(pParse, pTabList, pEList);
-  }
-
   sqlite3DbFree(db, sAggInfo.aCol);
   sqlite3DbFree(db, sAggInfo.aFunc);
 #if SELECTTRACE_ENABLED
@@ -164396,6 +164547,7 @@ struct RtreeGeomCallback {
 ** value to avoid operating on invalid blobs (which could cause a segfault).
 */
 #define RTREE_GEOMETRY_MAGIC 0x891245AB
+#define RTREE_GEOMETRY_SUBTYPE 0x52
 
 /*
 ** An instance of this structure (in the form of a BLOB) is returned by
@@ -165705,7 +165857,11 @@ static int deserializeGeometry(sqlite3_value *pValue, RtreeConstraint *pCons){
   int nExpected;                     /* Expected size of the BLOB */
 
   /* Check that value is actually a blob. */
-  if( sqlite3_value_type(pValue)!=SQLITE_BLOB ) return SQLITE_ERROR;
+  if( sqlite3_value_type(pValue)!=SQLITE_BLOB
+   || sqlite3_value_subtype(pValue)!=RTREE_GEOMETRY_SUBTYPE
+  ){
+    return SQLITE_ERROR;
+  }
 
   /* Check that the blob is roughly the right size. */
   nBlob = sqlite3_value_bytes(pValue);
@@ -167776,6 +167932,7 @@ static void geomCallback(sqlite3_context *ctx, int nArg, sqlite3_value **aArg){
       rtreeMatchArgFree(pBlob);
     }else{
       sqlite3_result_blob(ctx, pBlob, nBlob, rtreeMatchArgFree);
+      sqlite3_result_subtype(ctx, RTREE_GEOMETRY_SUBTYPE);
     }
   }
 }
@@ -199068,7 +199225,7 @@ static void fts5SourceIdFunc(
 ){
   assert( nArg==0 );
   UNUSED_PARAM2(nArg, apUnused);
-  sqlite3_result_text(pCtx, "fts5: 2017-05-25 16:50:27 edb4e819b0c058c7d74d27ebd14cc5ceb2bad6a6144a486a970182b7afe3f8b9", -1, SQLITE_TRANSIENT);
+  sqlite3_result_text(pCtx, "fts5: 2017-08-18 19:28:12 605907e73adb4533b12d22be8422f17a8dc125b5c37bb391756a11fc3a8c4d10", -1, SQLITE_TRANSIENT);
 }
 
 static int fts5Init(sqlite3 *db){
diff --git a/dist/sqlite3.h b/dist/sqlite3.h
index 296ada0..977b05b 100644
--- a/dist/sqlite3.h
+++ b/dist/sqlite3.h
@@ -121,9 +121,9 @@ extern "C" {
 ** [sqlite3_libversion_number()], [sqlite3_sourceid()],
 ** [sqlite_version()] and [sqlite_source_id()].
 */
-#define SQLITE_VERSION        "3.19.2"
-#define SQLITE_VERSION_NUMBER 3019002
-#define SQLITE_SOURCE_ID      "2017-05-25 16:50:27 edb4e819b0c058c7d74d27ebd14cc5ceb2bad6a6144a486a970182b7afe3f8b9"
+#define SQLITE_VERSION        "3.19.4"
+#define SQLITE_VERSION_NUMBER 3019004
+#define SQLITE_SOURCE_ID      "2017-08-18 19:28:12 605907e73adb4533b12d22be8422f17a8dc125b5c37bb391756a11fc3a8c4d10"
 
 /*
 ** CAPI3REF: Run-Time Library Version Numbers
@@ -494,6 +494,9 @@ SQLITE_API int sqlite3_exec(
 #define SQLITE_IOERR_CONVPATH          (SQLITE_IOERR | (26<<8))
 #define SQLITE_IOERR_VNODE             (SQLITE_IOERR | (27<<8))
 #define SQLITE_IOERR_AUTH              (SQLITE_IOERR | (28<<8))
+#define SQLITE_IOERR_BEGIN_ATOMIC      (SQLITE_IOERR | (29<<8))
+#define SQLITE_IOERR_COMMIT_ATOMIC     (SQLITE_IOERR | (30<<8))
+#define SQLITE_IOERR_ROLLBACK_ATOMIC   (SQLITE_IOERR | (31<<8))
 #define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
 #define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
 #define SQLITE_BUSY_SNAPSHOT           (SQLITE_BUSY   |  (2<<8))
@@ -580,6 +583,11 @@ SQLITE_API int sqlite3_exec(
 ** SQLITE_IOCAP_IMMUTABLE flag indicates that the file is on
 ** read-only media and cannot be changed even by processes with
 ** elevated privileges.
+**
+** The SQLITE_IOCAP_BATCH_ATOMIC property means that the underlying
+** filesystem supports doing multiple write operations atomically when those
+** write operations are bracketed by [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] and
+** [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].
 */
 #define SQLITE_IOCAP_ATOMIC                 0x00000001
 #define SQLITE_IOCAP_ATOMIC512              0x00000002
@@ -595,6 +603,7 @@ SQLITE_API int sqlite3_exec(
 #define SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN  0x00000800
 #define SQLITE_IOCAP_POWERSAFE_OVERWRITE    0x00001000
 #define SQLITE_IOCAP_IMMUTABLE              0x00002000
+#define SQLITE_IOCAP_BATCH_ATOMIC           0x00004000
 
 /*
 ** CAPI3REF: File Locking Levels
@@ -729,6 +738,7 @@ struct sqlite3_file {
 ** <li> [SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN]
 ** <li> [SQLITE_IOCAP_POWERSAFE_OVERWRITE]
 ** <li> [SQLITE_IOCAP_IMMUTABLE]
+** <li> [SQLITE_IOCAP_BATCH_ATOMIC]
 ** </ul>
 **
 ** The SQLITE_IOCAP_ATOMIC property means that all writes of
@@ -1012,6 +1022,40 @@ struct sqlite3_io_methods {
 ** The [SQLITE_FCNTL_RBU] opcode is implemented by the special VFS used by
 ** the RBU extension only.  All other VFS should return SQLITE_NOTFOUND for
 ** this opcode.  
+**
+** <li>[[SQLITE_FCNTL_BEGIN_ATOMIC_WRITE]]
+** If the [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] opcode returns SQLITE_OK, then
+** the file descriptor is placed in "batch write mode", which
+** means all subsequent write operations will be deferred and done
+** atomically at the next [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].  Systems
+** that do not support batch atomic writes will return SQLITE_NOTFOUND.
+** ^Following a successful SQLITE_FCNTL_BEGIN_ATOMIC_WRITE and prior to
+** the closing [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] or
+** [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE], SQLite will make
+** no VFS interface calls on the same [sqlite3_file] file descriptor
+** except for calls to the xWrite method and the xFileControl method
+** with [SQLITE_FCNTL_SIZE_HINT].
+**
+** <li>[[SQLITE_FCNTL_COMMIT_ATOMIC_WRITE]]
+** The [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] opcode causes all write
+** operations since the previous successful call to 
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be performed atomically.
+** This file control returns [SQLITE_OK] if and only if the writes were
+** all performed successfully and have been committed to persistent storage.
+** ^Regardless of whether or not it is successful, this file control takes
+** the file descriptor out of batch write mode so that all subsequent
+** write operations are independent.
+** ^SQLite will never invoke SQLITE_FCNTL_COMMIT_ATOMIC_WRITE without
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
+**
+** <li>[[SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE]]
+** The [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE] opcode causes all write
+** operations since the previous successful call to 
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be rolled back.
+** ^This file control takes the file descriptor out of batch write mode
+** so that all subsequent write operations are independent.
+** ^SQLite will never invoke SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE without
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
 ** </ul>
 */
 #define SQLITE_FCNTL_LOCKSTATE               1
@@ -1043,6 +1087,9 @@ struct sqlite3_io_methods {
 #define SQLITE_FCNTL_JOURNAL_POINTER        28
 #define SQLITE_FCNTL_WIN32_GET_HANDLE       29
 #define SQLITE_FCNTL_PDB                    30
+#define SQLITE_FCNTL_BEGIN_ATOMIC_WRITE     31
+#define SQLITE_FCNTL_COMMIT_ATOMIC_WRITE    32
+#define SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE  33
 
 /* deprecated names */
 #define SQLITE_GET_LOCKPROXYFILE      SQLITE_FCNTL_GET_LOCKPROXYFILE