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Avoid an unnecessary seek operation on some corner-case skip-scans.

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FossilOrigin-Name: 38e837e605076124b73235e1fd832838d9545cb2
This commit is contained in:
drh
2016-02-22 20:52:26 +00:00
parent b9626cfa70
commit a6d2f8eb1e
3 changed files with 23 additions and 18 deletions
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24
src/wherecode.c
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@@ -1212,17 +1212,19 @@ Bitmask sqlite3WhereCodeOneLoopStart(
start_constraints = 1;
}
codeApplyAffinity(pParse, regBase, nConstraint - bSeekPastNull, zStartAff);
op = aStartOp[(start_constraints<<2) + (startEq<<1) + bRev];
assert( op!=0 );
sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint);
VdbeCoverage(v);
VdbeCoverageIf(v, op==OP_Rewind); testcase( op==OP_Rewind );
VdbeCoverageIf(v, op==OP_Last); testcase( op==OP_Last );
VdbeCoverageIf(v, op==OP_SeekGT); testcase( op==OP_SeekGT );
VdbeCoverageIf(v, op==OP_SeekGE); testcase( op==OP_SeekGE );
VdbeCoverageIf(v, op==OP_SeekLE); testcase( op==OP_SeekLE );
VdbeCoverageIf(v, op==OP_SeekLT); testcase( op==OP_SeekLT );
if( pLoop->nSkip==0 || nConstraint>pLoop->nSkip ){
op = aStartOp[(start_constraints<<2) + (startEq<<1) + bRev];
assert( op!=0 );
sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint);
VdbeCoverage(v);
VdbeCoverageIf(v, op==OP_Rewind); testcase( op==OP_Rewind );
VdbeCoverageIf(v, op==OP_Last); testcase( op==OP_Last );
VdbeCoverageIf(v, op==OP_SeekGT); testcase( op==OP_SeekGT );
VdbeCoverageIf(v, op==OP_SeekGE); testcase( op==OP_SeekGE );
VdbeCoverageIf(v, op==OP_SeekLE); testcase( op==OP_SeekLE );
VdbeCoverageIf(v, op==OP_SeekLT); testcase( op==OP_SeekLT );
}
/* Load the value for the inequality constraint at the end of the
** range (if any).
*/