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Ensure a cursor used by the SeekScan operator does not point to a valid row on the first iteration of the loop. Possible fix for [2d6e8400].

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FossilOrigin-Name: 390cf60a286b13f454429f4652a133f95a7891a75c1ec6d16cd39990590fd3fb
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dan
2021-01-27 17:15:06 +00:00
parent e5ceaac446
commit df1b52e727
4 changed files with 46 additions and 9 deletions
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6
src/wherecode.c
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@@ -1743,6 +1743,12 @@ Bitmask sqlite3WhereCodeOneLoopStart(
SWAP(u8, nBtm, nTop);
}
if( iLevel>0 && (pLoop->wsFlags & WHERE_IN_SEEKSCAN)!=0 ){
/* In case OP_SeekScan is used, ensure that the index cursor does not
** point to a valid row for the first iteration of this loop. */
sqlite3VdbeAddOp1(v, OP_NullRow, iIdxCur);
}
/* Generate code to evaluate all constraint terms using == or IN
** and store the values of those terms in an array of registers
** starting at regBase.