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Improvements to the IN-early-out optimization so that it works more

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efficiently when there are two or more indexed IN clauses on a single table.

FossilOrigin-Name: 35505c68c1945c35babd2496e02bc4907a15c8e7b8d77f05f230bd0e9d4891d7
This commit is contained in:
drh
2020-09-01 01:52:03 +00:00
parent d321b6f4ad
commit fa17e134b2
6 changed files with 51 additions and 35 deletions
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12
src/wherecode.c
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@@ -570,6 +570,9 @@ static int codeEqualityTerm(
if( pLevel->u.in.nIn==0 ){
pLevel->addrNxt = sqlite3VdbeMakeLabel(pParse);
}
if( iEq>0 ){
pLoop->wsFlags |= WHERE_IN_EARLYOUT;
}
i = pLevel->u.in.nIn;
pLevel->u.in.nIn += nEq;
@@ -596,7 +599,6 @@ static int codeEqualityTerm(
if( iEq>0 ){
pIn->iBase = iReg - i;
pIn->nPrefix = i;
pLoop->wsFlags |= WHERE_IN_EARLYOUT;
}else{
pIn->nPrefix = 0;
}
@@ -606,6 +608,9 @@ static int codeEqualityTerm(
pIn++;
}
}
if( iEq>0 ){
sqlite3VdbeAddOp3(v, OP_SeekHit, pLevel->iIdxCur, 0, iEq);
}
}else{
pLevel->u.in.nIn = 0;
}
@@ -1789,9 +1794,6 @@ Bitmask sqlite3WhereCodeOneLoopStart(
** above has already left the cursor sitting on the correct row,
** so no further seeking is needed */
}else{
if( pLoop->wsFlags & WHERE_IN_EARLYOUT ){
sqlite3VdbeAddOp1(v, OP_SeekHit, iIdxCur);
}
if( regBignull ){
sqlite3VdbeAddOp2(v, OP_Integer, 1, regBignull);
VdbeComment((v, "NULL-scan pass ctr"));
@@ -1902,7 +1904,7 @@ Bitmask sqlite3WhereCodeOneLoopStart(
}
if( pLoop->wsFlags & WHERE_IN_EARLYOUT ){
sqlite3VdbeAddOp2(v, OP_SeekHit, iIdxCur, 1);
sqlite3VdbeAddOp3(v, OP_SeekHit, iIdxCur, nEq, nEq);
}
/* Seek the table cursor, if required */