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Experimental implementation of NULLS FIRST/LAST. This branch still has problems - the most significant of which is that ORDER BY clauses with a non-default NULLS FIRST/LAST qualifier can never use an index.

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FossilOrigin-Name: 07babb0f897fc8c9cb5b30481899c32fdd743f3f3ca508d8d957826252107dd5
This commit is contained in:
dan
2019-08-12 16:36:38 +00:00
parent 41428a97b8
commit 6e11892db8
14 changed files with 171 additions and 64 deletions
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7
src/vdbe.c
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@@ -2227,9 +2227,14 @@ case OP_Compare: {
REGISTER_TRACE(p2+idx, &aMem[p2+idx]);
assert( i<pKeyInfo->nKeyField );
pColl = pKeyInfo->aColl[i];
bRev = pKeyInfo->aSortOrder[i];
bRev = (pKeyInfo->aSortFlags[i] & KEYINFO_ORDER_DESC);
iCompare = sqlite3MemCompare(&aMem[p1+idx], &aMem[p2+idx], pColl);
if( iCompare ){
if( (pKeyInfo->aSortFlags[i] & KEYINFO_ORDER_BIGNULL)
&& ((aMem[p1+idx].flags & MEM_Null) || (aMem[p2+idx].flags & MEM_Null))
){
iCompare = -iCompare;
}
if( bRev ) iCompare = -iCompare;
break;
}