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The top of an index equality loop normally starts with OP_SeekGE and OP_IdxGT.

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This check-in adds a flag to OP_SeekGE such that it fails immediately if
the key is not equal, then jumps over the OP_IdxGT, saving a call to the key
comparison functions.  Consider this check-in a proof-of-concept.  It needs 
improvement before going on trunk.  Some tests fail, but only because they
new use fewer key comparisons than expected (which is a good thing!).

FossilOrigin-Name: 32e31b9bc8664afcd326a1ff3892d86dc5202474
This commit is contained in:
drh
2015-11-05 20:25:09 +00:00
parent d82211db56
commit 70528d7868
7 changed files with 39 additions and 16 deletions
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3
src/vdbeaux.c
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@@ -3969,6 +3969,7 @@ int sqlite3VdbeRecordCompareWithSkip(
|| vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, pPKey2->default_rc)
|| pKeyInfo->db->mallocFailed
);
pPKey2->eqSeen = 1;
return pPKey2->default_rc;
}
int sqlite3VdbeRecordCompare(
@@ -4068,6 +4069,7 @@ 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) );
@@ -4114,6 +4116,7 @@ static int vdbeRecordCompareString(
res = sqlite3VdbeRecordCompareWithSkip(nKey1, pKey1, pPKey2, 1);
}else{
res = pPKey2->default_rc;
pPKey2->eqSeen = 1;
}
}else if( res>0 ){
res = pPKey2->r2;