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Make sure indexes on expressions skip over initial NULL values in the

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index.  Fix for ticket [4baa464912129477f3c9]

FossilOrigin-Name: 71797ba431085f9ae381ed5ea6471967926f4043
This commit is contained in:
drh
2016-10-10 13:29:15 +00:00
parent ea5e5f0b89
commit 48590fcb37
4 changed files with 30 additions and 14 deletions
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10
src/wherecode.c
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@ -1446,11 +1446,11 @@ Bitmask sqlite3WhereCodeOneLoopStart(
pLevel->iLikeRepCntr |= bRev ^ (pIdx->aSortOrder[nEq]==SQLITE_SO_DESC);
}
#endif
if( pRangeStart==0
&& (j = pIdx->aiColumn[nEq])>=0
&& pIdx->pTable->aCol[j].notNull==0
){
bSeekPastNull = 1;
if( pRangeStart==0 ){
j = pIdx->aiColumn[nEq];
if( (j>=0 && pIdx->pTable->aCol[j].notNull==0) || j==XN_EXPR ){
bSeekPastNull = 1;
}
}
}
assert( pRangeEnd==0 || (pRangeEnd->wtFlags & TERM_VNULL)==0 );