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Add the WHERE_IN_EARLYOUT flag and use it to clarify the logic of this

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optimization.

FossilOrigin-Name: 522f1eacc20f11002cad58232a7c2610f369568653510e54f46088f579f778dc
This commit is contained in:
drh
2018-06-07 14:59:22 +00:00
parent bd573c459b
commit f7b0a5f3c3
5 changed files with 14 additions and 11 deletions
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5
src/wherecode.c
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@@ -595,6 +595,7 @@ static int codeEqualityTerm(
if( (pLoop->wsFlags & WHERE_VIRTUALTABLE)==0 ){
pIn->iBase = iReg - i;
pIn->nPrefix = i;
pLoop->wsFlags |= WHERE_IN_EARLYOUT;
}else{
pIn->nPrefix = 0;
}
@@ -1664,7 +1665,7 @@ 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_ABLE ){
if( pLoop->wsFlags & WHERE_IN_EARLYOUT ){
sqlite3VdbeAddOp1(v, OP_SeekHit, iIdxCur);
}
op = aStartOp[(start_constraints<<2) + (startEq<<1) + bRev];
@@ -1730,7 +1731,7 @@ Bitmask sqlite3WhereCodeOneLoopStart(
testcase( op==OP_IdxLE ); VdbeCoverageIf(v, op==OP_IdxLE );
}
if( pLoop->wsFlags & WHERE_IN_ABLE ){
if( pLoop->wsFlags & WHERE_IN_EARLYOUT ){
sqlite3VdbeAddOp2(v, OP_SeekHit, iIdxCur, 1);
}