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Avoid redundant table b-tree cursor seeks in UPDATE statements that use the

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two-pass strategy.

FossilOrigin-Name: dc555b1039c6930f6d15355c698ff917a85e8056
This commit is contained in:
dan
2017-01-28 19:45:34 +00:00
parent 6034d47618
commit f64ece143c
7 changed files with 62 additions and 15 deletions
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5
src/wherecode.c
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@ -1591,7 +1591,10 @@ Bitmask sqlite3WhereCodeOneLoopStart(
if( omitTable ){
/* pIdx is a covering index. No need to access the main table. */
}else if( HasRowid(pIdx->pTable) ){
if( (pWInfo->wctrlFlags & WHERE_SEEK_TABLE)!=0 ){
if( (pWInfo->wctrlFlags & WHERE_SEEK_TABLE) || (
(pWInfo->wctrlFlags & WHERE_SEEK_UNIQ_TABLE)
&& (pWInfo->eOnePass==ONEPASS_SINGLE)
)){
iRowidReg = ++pParse->nMem;
sqlite3VdbeAddOp2(v, OP_IdxRowid, iIdxCur, iRowidReg);
sqlite3ExprCacheStore(pParse, iCur, -1, iRowidReg);