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Add the OP_IfNoHope and OP_SeekHit opcodes used to reduce the number of

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unnecessary sqlite3BtreeMovetoUnpacked() calls when checking for an early
exit on IN-operator loops.  Futher optimizations are likely possible here.

FossilOrigin-Name: 6bf251af4347165a470d39457d61ab6d2a06c206db8f30bd8be5dbb388ae8a5b
This commit is contained in:
drh
2018-06-05 20:45:20 +00:00
parent 86d0ea7558
commit 8c2b6d784b
6 changed files with 74 additions and 12 deletions
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7
src/wherecode.c
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@@ -1664,6 +1664,9 @@ 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 ){
sqlite3VdbeAddOp1(v, OP_SeekHit, iIdxCur);
}
op = aStartOp[(start_constraints<<2) + (startEq<<1) + bRev];
assert( op!=0 );
sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint);
@@ -1727,6 +1730,10 @@ Bitmask sqlite3WhereCodeOneLoopStart(
testcase( op==OP_IdxLE ); VdbeCoverageIf(v, op==OP_IdxLE );
}
if( pLoop->wsFlags & WHERE_IN_ABLE ){
sqlite3VdbeAddOp2(v, OP_SeekHit, iIdxCur, 1);
}
/* Seek the table cursor, if required */
if( omitTable ){
/* pIdx is a covering index. No need to access the main table. */