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Merge recent enhancements from trunk.

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FossilOrigin-Name: 39d55579376906f212271ce9b2d367e3ad029fb173f22c7253312b467970208a
This commit is contained in:
drh
2019-12-31 14:49:10 +00:00
parent d335bc40a6 02ff747bc0
commit 5f6a2ed7f2
80 changed files with 2558 additions and 493 deletions
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13
src/update.c
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@@ -191,6 +191,7 @@ void sqlite3Update(
int iPk = 0; /* First of nPk cells holding PRIMARY KEY value */
i16 nPk = 0; /* Number of components of the PRIMARY KEY */
int bReplace = 0; /* True if REPLACE conflict resolution might happen */
int bFinishSeek = 1; /* The OP_FinishSeek opcode is needed */
/* Register Allocations */
int regRowCount = 0; /* A count of rows changed */
@@ -524,6 +525,7 @@ void sqlite3Update(
pWInfo = 0;
eOnePass = ONEPASS_SINGLE;
sqlite3ExprIfFalse(pParse, pWhere, labelBreak, SQLITE_JUMPIFNULL);
bFinishSeek = 0;
}else{
/* Begin the database scan.
**
@@ -550,6 +552,7 @@ void sqlite3Update(
** strategy that uses an index for which one or more columns are being
** updated. */
eOnePass = sqlite3WhereOkOnePass(pWInfo, aiCurOnePass);
bFinishSeek = sqlite3WhereUsesDeferredSeek(pWInfo);
if( eOnePass!=ONEPASS_SINGLE ){
sqlite3MultiWrite(pParse);
if( eOnePass==ONEPASS_MULTI ){
@@ -713,6 +716,7 @@ void sqlite3Update(
testcase( i==31 );
testcase( i==32 );
sqlite3ExprCodeGetColumnOfTable(v, pTab, iDataCur, i, k);
bFinishSeek = 0;
}else{
sqlite3VdbeAddOp2(v, OP_Null, 0, k);
}
@@ -800,6 +804,15 @@ void sqlite3Update(
/* Delete the index entries associated with the current record. */
sqlite3GenerateRowIndexDelete(pParse, pTab, iDataCur, iIdxCur, aRegIdx, -1);
/* We must run the OP_FinishSeek opcode to resolve a prior
** OP_DeferredSeek if there is any possibility that there have been
** no OP_Column opcodes since the OP_DeferredSeek was issued. But
** we want to avoid the OP_FinishSeek if possible, as running it
** costs CPU cycles. */
if( bFinishSeek ){
sqlite3VdbeAddOp1(v, OP_FinishSeek, iDataCur);
}
/* If changing the rowid value, or if there are foreign key constraints
** to process, delete the old record. Otherwise, add a noop OP_Delete
** to invoke the pre-update hook.