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Overview
| Comment: | Add VDBE comments to the beginning and end of skip-scan loops. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | skip-scan |
| Files: | files | file ages | folders |
| SHA1: |
0c85d93b52311dee7980d977be6ed0dc |
| User & Date: | drh 2013-11-13 17:24:39 |
Context
|
2013-11-13
| ||
| 19:01 | Import the "PRAGMA vdbe_eqp" enhancement and the enhanced EXPLAIN formatting the shell from trunk. Fix a bug in skip-scan and add a test case to prevent a regression. (Closed-Leaf check-in: f668616a user: drh tags: skip-scan) | |
| 17:24 | Add VDBE comments to the beginning and end of skip-scan loops. (check-in: 0c85d93b user: drh tags: skip-scan) | |
| 16:58 | Improve the way that skip-scan loops are constructued. Add test cases. Improved the scoring of skip-scan loops. (check-in: 5e75ab93 user: drh tags: skip-scan) | |
Changes
Changes to src/where.c.
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if( !zAff ){
pParse->db->mallocFailed = 1;
}
if( nSkip ){
int iIdxCur = pLevel->iIdxCur;
sqlite3VdbeAddOp1(v, (bRev?OP_Last:OP_Rewind), iIdxCur);
j = sqlite3VdbeAddOp0(v, OP_Goto);
pLevel->addrSkip = sqlite3VdbeAddOp4Int(v, (bRev?OP_SeekLt:OP_SeekGt),
iIdxCur, 0, regBase, nSkip);
sqlite3VdbeJumpHere(v, j);
for(j=0; j<nSkip; j++){
sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, j, regBase+j);
assert( pIdx->aiColumn[j]>=0 );
................................................................................
sqlite3VdbeJumpHere(v, pIn->addrInTop-1);
}
sqlite3DbFree(db, pLevel->u.in.aInLoop);
}
sqlite3VdbeResolveLabel(v, pLevel->addrBrk);
if( pLevel->addrSkip ){
sqlite3VdbeAddOp2(v, OP_Goto, 0, pLevel->addrSkip);
sqlite3VdbeJumpHere(v, pLevel->addrSkip);
sqlite3VdbeJumpHere(v, pLevel->addrSkip-2);
}
if( pLevel->iLeftJoin ){
addr = sqlite3VdbeAddOp1(v, OP_IfPos, pLevel->iLeftJoin);
assert( (pLoop->wsFlags & WHERE_IDX_ONLY)==0
|| (pLoop->wsFlags & WHERE_INDEXED)!=0 );
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>
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if( !zAff ){
pParse->db->mallocFailed = 1;
}
if( nSkip ){
int iIdxCur = pLevel->iIdxCur;
sqlite3VdbeAddOp1(v, (bRev?OP_Last:OP_Rewind), iIdxCur);
VdbeComment((v, "begin skip-scan on %s", pIdx->zName));
j = sqlite3VdbeAddOp0(v, OP_Goto);
pLevel->addrSkip = sqlite3VdbeAddOp4Int(v, (bRev?OP_SeekLt:OP_SeekGt),
iIdxCur, 0, regBase, nSkip);
sqlite3VdbeJumpHere(v, j);
for(j=0; j<nSkip; j++){
sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, j, regBase+j);
assert( pIdx->aiColumn[j]>=0 );
................................................................................
sqlite3VdbeJumpHere(v, pIn->addrInTop-1);
}
sqlite3DbFree(db, pLevel->u.in.aInLoop);
}
sqlite3VdbeResolveLabel(v, pLevel->addrBrk);
if( pLevel->addrSkip ){
sqlite3VdbeAddOp2(v, OP_Goto, 0, pLevel->addrSkip);
VdbeComment((v, "next skip-scan on %s", pLoop->u.btree.pIndex->zName));
sqlite3VdbeJumpHere(v, pLevel->addrSkip);
sqlite3VdbeJumpHere(v, pLevel->addrSkip-2);
}
if( pLevel->iLeftJoin ){
addr = sqlite3VdbeAddOp1(v, OP_IfPos, pLevel->iLeftJoin);
assert( (pLoop->wsFlags & WHERE_IDX_ONLY)==0
|| (pLoop->wsFlags & WHERE_INDEXED)!=0 );
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