Data structure cleanup. Remove unused fields. Rearrange other files for

tighter packing and reduced memory usage.

FossilOrigin-Name: 0bc594e861ae1142e8c6c83f39b095e1432856bf

manifest

@@ -1,5 +1,5 @@
-C Simplified\sarray\sallocation\sin\sthe\sIdList\sand\sAggInfo\sobjects.
+C Data\sstructure\scleanup.\s\sRemove\sunused\sfields.\s\sRearrange\sother\sfiles\sfor\ntighter\spacking\sand\sreduced\smemory\susage.
-D 2012-02-02T03:38:30.479
+D 2012-02-02T15:50:17.008
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 3f79a373e57c3b92dabf76f40b065e719d31ac34
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -128,7 +128,7 @@ F src/btmutex.c 976f45a12e37293e32cae0281b15a21d48a8aaa7
 F src/btree.c 24bde768288b3365bc6acfbb24030f76fefe7e1f
 F src/btree.h 46e9f04672f1390255bc56865a3238b384d0f2d5
 F src/btreeInt.h 6c9960645c431c9456ca56498f43a2b3bf1fa8c2
-F src/build.c 7a03d1772f906ca1ba905858b4f19d4d8b34e59d
+F src/build.c c4d36e527f457f9992a6663365871dfa7c5094b8
 F src/callback.c 0425c6320730e6d3981acfb9202c1bed9016ad1a
 F src/complete.c dc1d136c0feee03c2f7550bafc0d29075e36deac
 F src/ctime.c a9c26822515f81ec21588cbb482ca6724be02e33
@@ -172,7 +172,7 @@ F src/pager.c 2d892f7b901a8867a33bc21742086165a3a99af8
 F src/pager.h a435da8421dc7844b7f9c7f37b636c160c50208a
 F src/parse.y f36fb379d4f82be77fab088ae280b86ed524016c
 F src/pcache.c f8043b433a57aba85384a531e3937a804432a346
-F src/pcache.h b1d8775a9bddf44e65edb0d20bfc57a4982f840f
+F src/pcache.h 1b5dcc3dc8103d03e625b177023ee67764fa6b7c
 F src/pcache1.c 281822d22265245b19f908cb3f5df725f7e11b06
 F src/pragma.c 350f59843f4ec4fca5dc63d497caf6433096bbdd
 F src/prepare.c ec4989f7f480544bdc4192fe663470d2a2d7d61e
@@ -184,7 +184,7 @@ F src/select.c b6eec9d11ec5df0d1fd11e8a0eed0fc2d2d96b25
 F src/shell.c 60d147c2411dd2d79a5151cfb9a068de87c7babe
 F src/sqlite.h.in 371c30e4be94b9b0ea6400ed66663fcf8e891eb4
 F src/sqlite3ext.h 6904f4aadf976f95241311fbffb00823075d9477
-F src/sqliteInt.h e4275be35f82b3da4734d0d8eb97c618a91bb1a1
+F src/sqliteInt.h 736f3a7748434200db7a9e0a352b67d1b8759e0a
 F src/sqliteLimit.h 164b0e6749d31e0daa1a4589a169d31c0dec7b3d
 F src/status.c 4568e72dfd36b6a5911f93457364deb072e0b03a
 F src/table.c 2cd62736f845d82200acfa1287e33feb3c15d62e
@@ -240,7 +240,7 @@ F src/update.c d3076782c887c10e882996550345da9c4c9f9dea
 F src/utf.c 890c67dcfcc7a74623c95baac7535aadfe265e84
 F src/util.c 9e07bd67dfafe9c75b1da78c87ba030cebbb5388
 F src/vacuum.c 0c0ba2242355c6048d65e2b333abe0f7c06348fa
-F src/vdbe.c 595a240233b88960dd99380edf2fb7ec4317ee24
+F src/vdbe.c 43ea77c83e7f35169328f13b20cc8140bd2cf473
 F src/vdbe.h 18f581cac1f4339ec3299f3e0cc6e11aec654cdb
 F src/vdbeInt.h 2e79ce66ff45a01411151957bb2899af680f1560
 F src/vdbeapi.c 3662b6a468a2a4605a15dfab313baa6dff81ad91
@@ -988,7 +988,7 @@ F tool/tostr.awk e75472c2f98dd76e06b8c9c1367f4ab07e122d06
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
 F tool/warnings-clang.sh 9f406d66e750e8ac031c63a9ef3248aaa347ef2a
 F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
-P a3553b8a035b70e76a5a325b9e9f379f84de3955
+P 25df2a7458d025bc00380b4a0893637639f9f0d4
-R 0dee572dcbe8f4a7b8dff88e26875d80
+R d2ba4c243c1dae496337618e0657e24d
 U drh
-Z 566ebf07e0f933f12b6e71767840fbdb
+Z ada6e2e4fcf7ab0bc8362d130037dce6

manifest.uuid

@@ -1 +1 @@
-25df2a7458d025bc00380b4a0893637639f9f0d4
+0bc594e861ae1142e8c6c83f39b095e1432856bf

src/build.c

@@ -1638,7 +1638,6 @@ void sqlite3EndTable(
       return;
     }
     pParse->pNewTable = 0;
-    db->nTable++;
     db->flags |= SQLITE_InternChanges;
 
 #ifndef SQLITE_OMIT_ALTERTABLE

src/pcache.h

@@ -27,8 +27,8 @@ struct PgHdr {
   void *pData;                   /* Page data */
   void *pExtra;                  /* Extra content */
   PgHdr *pDirty;                 /* Transient list of dirty pages */
-  Pgno pgno;                     /* Page number for this page */
   Pager *pPager;                 /* The pager this page is part of */
+  Pgno pgno;                     /* Page number for this page */
 #ifdef SQLITE_CHECK_PAGES
   u32 pageHash;                  /* Hash of page content */
 #endif

src/sqliteInt.h

@@ -797,35 +797,16 @@ struct FuncDefHash {
 
 /*
 ** Each database connection is an instance of the following structure.
-**
-** The sqlite.lastRowid records the last insert rowid generated by an
-** insert statement.  Inserts on views do not affect its value.  Each
-** trigger has its own context, so that lastRowid can be updated inside
-** triggers as usual.  The previous value will be restored once the trigger
-** exits.  Upon entering a before or instead of trigger, lastRowid is no
-** longer (since after version 2.8.12) reset to -1.
-**
-** The sqlite.nChange does not count changes within triggers and keeps no
-** context.  It is reset at start of sqlite3_exec.
-** The sqlite.lsChange represents the number of changes made by the last
-** insert, update, or delete statement.  It remains constant throughout the
-** length of a statement and is then updated by OP_SetCounts.  It keeps a
-** context stack just like lastRowid so that the count of changes
-** within a trigger is not seen outside the trigger.  Changes to views do not
-** affect the value of lsChange.
-** The sqlite.csChange keeps track of the number of current changes (since
-** the last statement) and is used to update sqlite_lsChange.
-**
-** The member variables sqlite.errCode, sqlite.zErrMsg and sqlite.zErrMsg16
-** store the most recent error code and, if applicable, string. The
-** internal function sqlite3Error() is used to set these variables
-** consistently.
 */
 struct sqlite3 {
   sqlite3_vfs *pVfs;            /* OS Interface */
-  int nDb;                      /* Number of backends currently in use */
+  struct Vdbe *pVdbe;           /* List of active virtual machines */
+  CollSeq *pDfltColl;           /* The default collating sequence (BINARY) */
+  sqlite3_mutex *mutex;         /* Connection mutex */
   Db *aDb;                      /* All backends */
+  int nDb;                      /* Number of backends currently in use */
   int flags;                    /* Miscellaneous flags. See below */
+  i64 lastRowid;                /* ROWID of most recent insert (see above) */
   unsigned int openFlags;       /* Flags passed to sqlite3_vfs.xOpen() */
   int errCode;                  /* Most recent error code (SQLITE_*) */
   int errMask;                  /* & result codes with this before returning */
@@ -836,27 +817,23 @@ struct sqlite3 {
   signed char nextAutovac;      /* Autovac setting after VACUUM if >=0 */
   u8 suppressErr;               /* Do not issue error messages if true */
   u8 vtabOnConflict;            /* Value to return for s3_vtab_on_conflict() */
+  u8 isTransactionSavepoint;    /* True if the outermost savepoint is a TS */
   int nextPagesize;             /* Pagesize after VACUUM if >0 */
-  int nTable;                   /* Number of tables in the database */
-  CollSeq *pDfltColl;           /* The default collating sequence (BINARY) */
-  i64 lastRowid;                /* ROWID of most recent insert (see above) */
   u32 magic;                    /* Magic number for detect library misuse */
   int nChange;                  /* Value returned by sqlite3_changes() */
   int nTotalChange;             /* Value returned by sqlite3_total_changes() */
-  sqlite3_mutex *mutex;         /* Connection mutex */
   int aLimit[SQLITE_N_LIMIT];   /* Limits */
   struct sqlite3InitInfo {      /* Information used during initialization */
-    int iDb;                    /* When back is being initialized */
     int newTnum;                /* Rootpage of table being initialized */
+    u8 iDb;                     /* Which db file is being initialized */
     u8 busy;                    /* TRUE if currently initializing */
     u8 orphanTrigger;           /* Last statement is orphaned TEMP trigger */
   } init;
-  int nExtension;               /* Number of loaded extensions */
-  void **aExtension;            /* Array of shared library handles */
-  struct Vdbe *pVdbe;           /* List of active virtual machines */
   int activeVdbeCnt;            /* Number of VDBEs currently executing */
   int writeVdbeCnt;             /* Number of active VDBEs that are writing */
   int vdbeExecCnt;              /* Number of nested calls to VdbeExec() */
+  int nExtension;               /* Number of loaded extensions */
+  void **aExtension;            /* Array of shared library handles */
   void (*xTrace)(void*,const char*);        /* Trace function */
   void *pTraceArg;                          /* Argument to the trace function */
   void (*xProfile)(void*,const char*,u64);  /* Profiling function */
@@ -893,21 +870,20 @@ struct sqlite3 {
   int nProgressOps;             /* Number of opcodes for progress callback */
 #endif
 #ifndef SQLITE_OMIT_VIRTUALTABLE
+  int nVTrans;                  /* Allocated size of aVTrans */
   Hash aModule;                 /* populated by sqlite3_create_module() */
   VtabCtx *pVtabCtx;            /* Context for active vtab connect/create */
   VTable **aVTrans;             /* Virtual tables with open transactions */
-  int nVTrans;                  /* Allocated size of aVTrans */
   VTable *pDisconnect;    /* Disconnect these in next sqlite3_prepare() */
 #endif
   FuncDefHash aFunc;            /* Hash table of connection functions */
   Hash aCollSeq;                /* All collating sequences */
   BusyHandler busyHandler;      /* Busy callback */
-  int busyTimeout;              /* Busy handler timeout, in msec */
   Db aDbStatic[2];              /* Static space for the 2 default backends */
   Savepoint *pSavepoint;        /* List of active savepoints */
+  int busyTimeout;              /* Busy handler timeout, in msec */
   int nSavepoint;               /* Number of non-transaction savepoints */
   int nStatement;               /* Number of nested statement-transactions  */
-  u8 isTransactionSavepoint;    /* True if the outermost savepoint is a TS */
   i64 nDeferredCons;            /* Net deferred constraints this transaction. */
   int *pnBytesFreed;            /* If not NULL, increment this in DbFree() */
 
@@ -1039,7 +1015,6 @@ struct FuncDestructor {
 #define SQLITE_FUNC_CASE     0x02 /* Case-sensitive LIKE-type function */
 #define SQLITE_FUNC_EPHEM    0x04 /* Ephemeral.  Delete with VDBE */
 #define SQLITE_FUNC_NEEDCOLL 0x08 /* sqlite3GetFuncCollSeq() might be called */
-#define SQLITE_FUNC_PRIVATE  0x10 /* Allowed for internal use only */
 #define SQLITE_FUNC_COUNT    0x20 /* Built-in count(*) aggregate */
 #define SQLITE_FUNC_COALESCE 0x40 /* Built-in coalesce() or ifnull() function */
 
@@ -1322,8 +1297,6 @@ struct Table {
 #define TF_HasPrimaryKey   0x04    /* Table has a primary key */
 #define TF_Autoincrement   0x08    /* Integer primary key is autoincrement */
 #define TF_Virtual         0x10    /* Is a virtual table */
-#define TF_NeedMetadata    0x20    /* aCol[].zType and aCol[].pColl missing */
-
 
 
 /*
@@ -1485,19 +1458,19 @@ struct UnpackedRecord {
 */
 struct Index {
   char *zName;     /* Name of this index */
-  int nColumn;     /* Number of columns in the table used by this index */
   int *aiColumn;   /* Which columns are used by this index.  1st is 0 */
   tRowcnt *aiRowEst; /* Result of ANALYZE: Est. rows selected by each column */
   Table *pTable;   /* The SQL table being indexed */
-  int tnum;        /* Page containing root of this index in database file */
-  u8 onError;      /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */
-  u8 autoIndex;    /* True if is automatically created (ex: by UNIQUE) */
-  u8 bUnordered;   /* Use this index for == or IN queries only */
   char *zColAff;   /* String defining the affinity of each column */
   Index *pNext;    /* The next index associated with the same table */
   Schema *pSchema; /* Schema containing this index */
   u8 *aSortOrder;  /* Array of size Index.nColumn. True==DESC, False==ASC */
   char **azColl;   /* Array of collation sequence names for index */
+  int nColumn;     /* Number of columns in the table used by this index */
+  int tnum;        /* Page containing root of this index in database file */
+  u8 onError;      /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */
+  u8 autoIndex;    /* True if is automatically created (ex: by UNIQUE) */
+  u8 bUnordered;   /* Use this index for == or IN queries only */
 #ifdef SQLITE_ENABLE_STAT3
   int nSample;             /* Number of elements in aSample[] */
   tRowcnt avgEq;           /* Average nEq value for key values not in aSample */
@@ -1556,8 +1529,8 @@ struct AggInfo {
                           ** than the source table */
   int sortingIdx;         /* Cursor number of the sorting index */
   int sortingIdxPTab;     /* Cursor number of pseudo-table */
-  ExprList *pGroupBy;     /* The group by clause */
   int nSortingColumn;     /* Number of columns in the sorting index */
+  ExprList *pGroupBy;     /* The group by clause */
   struct AggInfo_col {    /* For each column used in source tables */
     Table *pTab;             /* Source table */
     int iTable;              /* Cursor number of the source table */
@@ -2060,6 +2033,9 @@ struct Select {
   u8 op;                 /* One of: TK_UNION TK_ALL TK_INTERSECT TK_EXCEPT */
   char affinity;         /* MakeRecord with this affinity for SRT_Set */
   u16 selFlags;          /* Various SF_* values */
+  int iLimit, iOffset;   /* Memory registers holding LIMIT & OFFSET counters */
+  int addrOpenEphm[3];   /* OP_OpenEphem opcodes related to this select */
+  double nSelectRow;     /* Estimated number of result rows */
   SrcList *pSrc;         /* The FROM clause */
   Expr *pWhere;          /* The WHERE clause */
   ExprList *pGroupBy;    /* The GROUP BY clause */
@@ -2070,9 +2046,6 @@ struct Select {
   Select *pRightmost;    /* Right-most select in a compound select statement */
   Expr *pLimit;          /* LIMIT expression. NULL means not used. */
   Expr *pOffset;         /* OFFSET expression. NULL means not used. */
-  int iLimit, iOffset;   /* Memory registers holding LIMIT & OFFSET counters */
-  int addrOpenEphm[3];   /* OP_OpenEphem opcodes related to this select */
-  double nSelectRow;     /* Estimated number of result rows */
 };
 
 /*
@@ -2164,10 +2137,10 @@ struct AutoincInfo {
 */
 struct TriggerPrg {
   Trigger *pTrigger;      /* Trigger this program was coded from */
-  int orconf;             /* Default ON CONFLICT policy */
-  SubProgram *pProgram;   /* Program implementing pTrigger/orconf */
-  u32 aColmask[2];        /* Masks of old.*, new.* columns accessed */
   TriggerPrg *pNext;      /* Next entry in Parse.pTriggerPrg list */
+  SubProgram *pProgram;   /* Program implementing pTrigger/orconf */
+  int orconf;             /* Default ON CONFLICT policy */
+  u32 aColmask[2];        /* Masks of old.*, new.* columns accessed */
 };
 
 /*
@@ -2197,14 +2170,18 @@ struct TriggerPrg {
 */
 struct Parse {
   sqlite3 *db;         /* The main database structure */
-  int rc;              /* Return code from execution */
   char *zErrMsg;       /* An error message */
   Vdbe *pVdbe;         /* An engine for executing database bytecode */
+  int rc;              /* Return code from execution */
   u8 colNamesSet;      /* TRUE after OP_ColumnName has been issued to pVdbe */
   u8 checkSchema;      /* Causes schema cookie check after an error */
   u8 nested;           /* Number of nested calls to the parser/code generator */
   u8 nTempReg;         /* Number of temporary registers in aTempReg[] */
   u8 nTempInUse;       /* Number of aTempReg[] currently checked out */
+  u8 nColCache;        /* Number of entries in aColCache[] */
+  u8 iColCache;        /* Next entry in aColCache[] to replace */
+  u8 isMultiWrite;     /* True if statement may modify/insert multiple rows */
+  u8 mayAbort;         /* True if statement may throw an ABORT exception */
   int aTempReg[8];     /* Holding area for temporary registers */
   int nRangeReg;       /* Size of the temporary register block */
   int iRangeReg;       /* First register in temporary register block */
@@ -2216,8 +2193,6 @@ struct Parse {
   int ckBase;          /* Base register of data during check constraints */
   int iCacheLevel;     /* ColCache valid when aColCache[].iLevel<=iCacheLevel */
   int iCacheCnt;       /* Counter used to generate aColCache[].lru values */
-  u8 nColCache;        /* Number of entries in aColCache[] */
-  u8 iColCache;        /* Next entry in aColCache[] to replace */
   struct yColCache {
     int iTable;           /* Table cursor number */
     int iColumn;          /* Table column number */
@@ -2228,61 +2203,63 @@ struct Parse {
   } aColCache[SQLITE_N_COLCACHE];  /* One for each column cache entry */
   yDbMask writeMask;   /* Start a write transaction on these databases */
   yDbMask cookieMask;  /* Bitmask of schema verified databases */
-  u8 isMultiWrite;     /* True if statement may affect/insert multiple rows */
-  u8 mayAbort;         /* True if statement may throw an ABORT exception */
   int cookieGoto;      /* Address of OP_Goto to cookie verifier subroutine */
   int cookieValue[SQLITE_MAX_ATTACHED+2];  /* Values of cookies to verify */
+  int regRowid;        /* Register holding rowid of CREATE TABLE entry */
+  int regRoot;         /* Register holding root page number for new objects */
+  int nMaxArg;         /* Max args passed to user function by sub-program */
 #ifndef SQLITE_OMIT_SHARED_CACHE
   int nTableLock;        /* Number of locks in aTableLock */
   TableLock *aTableLock; /* Required table locks for shared-cache mode */
 #endif
-  int regRowid;        /* Register holding rowid of CREATE TABLE entry */
-  int regRoot;         /* Register holding root page number for new objects */
   AutoincInfo *pAinc;  /* Information about AUTOINCREMENT counters */
-  int nMaxArg;         /* Max args passed to user function by sub-program */
 
   /* Information used while coding trigger programs. */
   Parse *pToplevel;    /* Parse structure for main program (or NULL) */
   Table *pTriggerTab;  /* Table triggers are being coded for */
+  double nQueryLoop;   /* Estimated number of iterations of a query */
   u32 oldmask;         /* Mask of old.* columns referenced */
   u32 newmask;         /* Mask of new.* columns referenced */
   u8 eTriggerOp;       /* TK_UPDATE, TK_INSERT or TK_DELETE */
   u8 eOrconf;          /* Default ON CONFLICT policy for trigger steps */
   u8 disableTriggers;  /* True to disable triggers */
-  double nQueryLoop;   /* Estimated number of iterations of a query */
 
   /* Above is constant between recursions.  Below is reset before and after
   ** each recursion */
 
-  int nVar;            /* Number of '?' variables seen in the SQL so far */
+  int nVar;                 /* Number of '?' variables seen in the SQL so far */
-  int nzVar;           /* Number of available slots in azVar[] */
+  int nzVar;                /* Number of available slots in azVar[] */
-  char **azVar;        /* Pointers to names of parameters */
+  u8 explain;               /* True if the EXPLAIN flag is found on the query */
-  Vdbe *pReprepare;    /* VM being reprepared (sqlite3Reprepare()) */
+#ifndef SQLITE_OMIT_VIRTUALTABLE
-  int nAlias;          /* Number of aliased result set columns */
+  u8 declareVtab;           /* True if inside sqlite3_declare_vtab() */
-  int *aAlias;         /* Register used to hold aliased result */
+  int nVtabLock;            /* Number of virtual tables to lock */
-  u8 explain;          /* True if the EXPLAIN flag is found on the query */
+#endif
-  Token sNameToken;    /* Token with unqualified schema object name */
+  int nAlias;               /* Number of aliased result set columns */
-  Token sLastToken;    /* The last token parsed */
+  int nHeight;              /* Expression tree height of current sub-select */
-  const char *zTail;   /* All SQL text past the last semicolon parsed */
+#ifndef SQLITE_OMIT_EXPLAIN
-  Table *pNewTable;    /* A table being constructed by CREATE TABLE */
+  int iSelectId;            /* ID of current select for EXPLAIN output */
+  int iNextSelectId;        /* Next available select ID for EXPLAIN output */
+#endif
+  char **azVar;             /* Pointers to names of parameters */
+  Vdbe *pReprepare;         /* VM being reprepared (sqlite3Reprepare()) */
+  int *aAlias;              /* Register used to hold aliased result */
+  const char *zTail;        /* All SQL text past the last semicolon parsed */
+  Table *pNewTable;         /* A table being constructed by CREATE TABLE */
   Trigger *pNewTrigger;     /* Trigger under construct by a CREATE TRIGGER */
   const char *zAuthContext; /* The 6th parameter to db->xAuth callbacks */
+  Token sNameToken;         /* Token with unqualified schema object name */
+  Token sLastToken;         /* The last token parsed */
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-  Token sArg;                /* Complete text of a module argument */
+  Token sArg;               /* Complete text of a module argument */
-  u8 declareVtab;            /* True if inside sqlite3_declare_vtab() */
+  Table **apVtabLock;       /* Pointer to virtual tables needing locking */
-  int nVtabLock;             /* Number of virtual tables to lock */
-  Table **apVtabLock;        /* Pointer to virtual tables needing locking */
-#endif
-  int nHeight;            /* Expression tree height of current sub-select */
-  Table *pZombieTab;      /* List of Table objects to delete after code gen */
-  TriggerPrg *pTriggerPrg;    /* Linked list of coded triggers */
-
-#ifndef SQLITE_OMIT_EXPLAIN
-  int iSelectId;
-  int iNextSelectId;
 #endif
+  Table *pZombieTab;        /* List of Table objects to delete after code gen */
+  TriggerPrg *pTriggerPrg;  /* Linked list of coded triggers */
 };
 
+/*
+** Return true if currently inside an sqlite3_declare_vtab() call.
+*/
 #ifdef SQLITE_OMIT_VIRTUALTABLE
   #define IN_DECLARE_VTAB 0
 #else
@@ -2433,8 +2410,8 @@ struct StrAccum {
 */
 typedef struct {
   sqlite3 *db;        /* The database being initialized */
-  int iDb;            /* 0 for main database.  1 for TEMP, 2.. for ATTACHed */
   char **pzErrMsg;    /* Error message stored here */
+  int iDb;            /* 0 for main database.  1 for TEMP, 2.. for ATTACHed */
   int rc;             /* Result code stored here */
 } InitData;
 

src/vdbe.c

@@ -2853,7 +2853,7 @@ case OP_AutoCommit: {
 ** throw an ABORT exception), a statement transaction may also be opened.
 ** More specifically, a statement transaction is opened iff the database
 ** connection is currently not in autocommit mode, or if there are other
-** active statements. A statement transaction allows the affects of this
+** active statements. A statement transaction allows the changes made by this
 ** VDBE to be rolled back after an error without having to roll back the
 ** entire transaction. If no error is encountered, the statement transaction
 ** will automatically commit when the VDBE halts.