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Avoid an unnecessary key comparison when doing an indexed lookup against an

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equality constraint.

FossilOrigin-Name: d741e1ccdce96e6142e294fbdd20a0282296dcea
This commit is contained in:
drh
2015-11-06 20:22:25 +00:00
parent f83075201f b1d607de25
commit 3adf8783b0
10 changed files with 94 additions and 50 deletions
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3
src/vdbeaux.c
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@@ -3993,6 +3993,7 @@ int sqlite3VdbeRecordCompareWithSkip(
|| vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, pPKey2->default_rc)
|| pKeyInfo->db->mallocFailed
);
pPKey2->eqSeen = 1;
return pPKey2->default_rc;
}
int sqlite3VdbeRecordCompare(
@@ -4092,6 +4093,7 @@ static int vdbeRecordCompareInt(
/* The first fields of the two keys are equal and there are no trailing
** fields. Return pPKey2->default_rc in this case. */
res = pPKey2->default_rc;
pPKey2->eqSeen = 1;
}
assert( vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, res) );
@@ -4139,6 +4141,7 @@ static int vdbeRecordCompareString(
res = sqlite3VdbeRecordCompareWithSkip(nKey1, pKey1, pPKey2, 1);
}else{
res = pPKey2->default_rc;
pPKey2->eqSeen = 1;
}
}else if( res>0 ){
res = pPKey2->r2;