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Overview
| Comment: | Avoid unnecessary OP_IfNull checks when doing a range query where there is a constraint on the lower bound of the range. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | de08a7e7abbad9b94d0268d096ef4555 |
| User & Date: | drh 2013-11-16 14:03:53 |
Context
|
2013-11-16
| ||
| 15:35 | Fully constraint the ORDER BY on the top-10 line of the --summary output from the wordcount test program. Add the run-wordcount.bash script for running wordcount in various configurations. check-in: 7edf39eb user: drh tags: trunk | |
| 14:03 | Avoid unnecessary OP_IfNull checks when doing a range query where there is a constraint on the lower bound of the range. check-in: de08a7e7 user: drh tags: trunk | |
| 13:55 | Simplification and performance improvement to the logic that factors constant expressions ouf of inner loops. check-in: ee9353fd user: drh tags: trunk | |
Changes
Changes to src/where.c.
3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 |
*/
r1 = sqlite3GetTempReg(pParse);
testcase( pLoop->wsFlags & WHERE_BTM_LIMIT );
testcase( pLoop->wsFlags & WHERE_TOP_LIMIT );
if( (pLoop->wsFlags & (WHERE_BTM_LIMIT|WHERE_TOP_LIMIT))!=0
&& (j = pIdx->aiColumn[nEq])>=0
&& pIdx->pTable->aCol[j].notNull==0
){
sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, nEq, r1);
VdbeComment((v, "%s", pIdx->pTable->aCol[j].zName));
sqlite3VdbeAddOp2(v, OP_IsNull, r1, addrCont);
}
sqlite3ReleaseTempReg(pParse, r1);
|
> |
3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 |
*/
r1 = sqlite3GetTempReg(pParse);
testcase( pLoop->wsFlags & WHERE_BTM_LIMIT );
testcase( pLoop->wsFlags & WHERE_TOP_LIMIT );
if( (pLoop->wsFlags & (WHERE_BTM_LIMIT|WHERE_TOP_LIMIT))!=0
&& (j = pIdx->aiColumn[nEq])>=0
&& pIdx->pTable->aCol[j].notNull==0
&& (nEq || (pLoop->wsFlags & WHERE_BTM_LIMIT)==0)
){
sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, nEq, r1);
VdbeComment((v, "%s", pIdx->pTable->aCol[j].zName));
sqlite3VdbeAddOp2(v, OP_IsNull, r1, addrCont);
}
sqlite3ReleaseTempReg(pParse, r1);
|