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Add support for "ORDER BY ... NULLS FIRST" and "ORDER BY ... NULLS LAST". Use this to fix ticket [f8a7060e].

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FossilOrigin-Name: 94085fb3e756bc984237b74b6e29c68462ad860870c64dcb5124feaeec387660
This commit is contained in:
dan
2019-08-27 19:59:21 +00:00
parent e893759cac 512e46a74c
commit 8085d53d3c
24 changed files with 2129 additions and 245 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;
}