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Overview
| Comment: | The one-pass optimization is now working for DELETE on WITHOUT ROWID tables. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | optimize-delete |
| Files: | files | file ages | folders |
| SHA1: |
e4d220a381388f900a95d1b656a82f14 |
| User & Date: | drh 2013-11-16 20:45:01 |
Context
|
2013-11-16
| ||
| 22:48 | Combine the rowid and WITHOUT ROWID paths for DELETE into a single path. check-in: c4734b88 user: drh tags: optimize-delete | |
| 20:45 | The one-pass optimization is now working for DELETE on WITHOUT ROWID tables. check-in: e4d220a3 user: drh tags: optimize-delete | |
| 20:13 | Enhance the DELETE logic so that it can make use of WHERE_ONEPASS_DESIRED for rowid tables. check-in: 8f479a72 user: drh tags: optimize-delete | |
Changes
Changes to src/delete.c.
382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 |
assert( pPk!=0 );
nPk = pPk->nKeyCol;
iPk = pParse->nMem+1;
pParse->nMem += nPk;
iKey = ++pParse->nMem;
iEph = pParse->nTab++;
sqlite3VdbeAddOp2(v, OP_OpenEphemeral, iEph, nPk);
sqlite3VdbeSetP4KeyInfo(pParse, pPk);
pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, 0, 0, 0, 0);
if( pWInfo==0 ) goto delete_from_cleanup;
for(i=0; i<nPk; i++){
sqlite3ExprCodeGetColumnOfTable(v, pTab, iTabCur, pPk->aiColumn[i],iPk+i);
}
sqlite3VdbeAddOp4(v, OP_MakeRecord, iPk, nPk, iKey,
sqlite3IndexAffinityStr(v, pPk), P4_TRANSIENT);
sqlite3VdbeAddOp2(v, OP_IdxInsert, iEph, iKey);
if( db->flags & SQLITE_CountRows ){
sqlite3VdbeAddOp2(v, OP_AddImm, memCnt, 1);
}
sqlite3WhereEnd(pWInfo);
/* Open cursors for all indices of the table.
*/
sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite, iTabCur, aToOpen,
&iDataCur, &iIdxCur);
/* Loop over the primary keys to be deleted. */
addr = sqlite3VdbeAddOp1(v, OP_Rewind, iEph);
sqlite3VdbeAddOp2(v, OP_RowKey, iEph, iPk);
/* Delete the row */
sqlite3GenerateRowDelete(pParse, pTab, pTrigger, iDataCur, iIdxCur,
iPk, 0, 1, OE_Default, 0);
/* End of the delete loop */
sqlite3VdbeAddOp2(v, OP_Next, iEph, addr+1);
sqlite3VdbeJumpHere(v, addr);
/* Close the cursors open on the table and its indexes. */
assert( iDataCur>=iIdxCur );
for(i=0, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){
sqlite3VdbeAddOp1(v, OP_Close, iIdxCur+i);
}
}else{
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assert( pPk!=0 );
nPk = pPk->nKeyCol;
iPk = pParse->nMem+1;
pParse->nMem += nPk;
iKey = ++pParse->nMem;
iEph = pParse->nTab++;
addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, iEph, nPk);
sqlite3VdbeSetP4KeyInfo(pParse, pPk);
pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, 0, 0,
WHERE_ONEPASS_DESIRED, iTabCur+1);
if( pWInfo==0 ) goto delete_from_cleanup;
okOnePass = sqlite3WhereOkOnePass(pWInfo, aiCurOnePass);
for(i=0; i<nPk; i++){
sqlite3ExprCodeGetColumnOfTable(v, pTab, iTabCur, pPk->aiColumn[i],iPk+i);
}
if( db->flags & SQLITE_CountRows ){
sqlite3VdbeAddOp2(v, OP_AddImm, memCnt, 1);
}
if( okOnePass ){
aToOpen = sqlite3DbMallocRaw(db, nIdx+2);
if( aToOpen==0 ) goto delete_from_cleanup;
memset(aToOpen, 1, nIdx+1);
aToOpen[nIdx+1] = 0;
if( aiCurOnePass[0]>=0 ) aToOpen[aiCurOnePass[0]-iTabCur] = 0;
if( aiCurOnePass[1]>=0 ) aToOpen[aiCurOnePass[1]-iTabCur] = 0;
sqlite3VdbeChangeToNoop(v, addr);
addr = sqlite3VdbeAddOp0(v, OP_Goto);
}else{
sqlite3VdbeAddOp4(v, OP_MakeRecord, iPk, nPk, iKey,
sqlite3IndexAffinityStr(v, pPk), P4_TRANSIENT);
sqlite3VdbeAddOp2(v, OP_IdxInsert, iEph, iKey);
}
sqlite3WhereEnd(pWInfo);
if( okOnePass ){
sqlite3VdbeAddOp0(v, OP_Halt);
sqlite3VdbeJumpHere(v, addr);
}
/* Open cursors for all indices of the table.
*/
sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite, iTabCur, aToOpen,
&iDataCur, &iIdxCur);
/* Loop over the primary keys to be deleted. */
if( !okOnePass ){
addr = sqlite3VdbeAddOp1(v, OP_Rewind, iEph);
sqlite3VdbeAddOp2(v, OP_RowKey, iEph, iPk);
}
/* Delete the row */
sqlite3GenerateRowDelete(pParse, pTab, pTrigger, iDataCur, iIdxCur,
iPk, nPk*okOnePass, 1, OE_Default, okOnePass);
/* End of the delete loop */
if( !okOnePass ){
sqlite3VdbeAddOp2(v, OP_Next, iEph, addr+1);
sqlite3VdbeJumpHere(v, addr);
}
/* Close the cursors open on the table and its indexes. */
assert( iDataCur>=iIdxCur );
for(i=0, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){
sqlite3VdbeAddOp1(v, OP_Close, iIdxCur+i);
}
}else{
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