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Changes directed toward optimizing IS NULL terms in WHERE clauses. (CVS 3492)

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FossilOrigin-Name: 4d336e9ef5f65b95959e7d01cd0357d46e9b1fa5
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drh
2006-10-27 14:06:57 +00:00
parent c49f44eff1
commit 0660e26efe
5 changed files with 38 additions and 37 deletions
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7
src/vdbeaux.c
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@@ -1892,14 +1892,13 @@ int sqlite3VdbeRecordCompare(
idx2 += GetVarint( aKey2+idx2, serial_type2 );
if( d2>=nKey2 && sqlite3VdbeSerialTypeLen(serial_type2)>0 ) break;
/* Assert that there is enough space left in each key for the blob of
** data to go with the serial type just read. This assert may fail if
** the file is corrupted. Then read the value from each key into mem1
** and mem2 respectively.
/* Extract the values to be compared.
*/
d1 += sqlite3VdbeSerialGet(&aKey1[d1], serial_type1, &mem1);
d2 += sqlite3VdbeSerialGet(&aKey2[d2], serial_type2, &mem2);
/* Do the comparison
*/
rc = sqlite3MemCompare(&mem1, &mem2, i<nField ? pKeyInfo->aColl[i] : 0);
if( mem1.flags & MEM_Dyn ) sqlite3VdbeMemRelease(&mem1);
if( mem2.flags & MEM_Dyn ) sqlite3VdbeMemRelease(&mem2);