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Overview
| Comment: | Fix the assert()s in the byte-code engine that prove that cursors are unidirectional. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | multikey-opt-idea |
| Files: | files | file ages | folders |
| SHA3-256: |
4b0b4e14039469b656662312a5f80f08 |
| User & Date: | drh 2018-06-07 18:01:21 |
Context
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2018-06-07
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| 18:13 | The IN-early-out optimization: When doing a look-up on a multi-column index and an IN operator is used on a column other than the left-most column, then if no rows match against the first IN value, check to make sure there exist rows that match the columns to the right before continuing with the next IN value. check-in: 09fffbdf user: drh tags: trunk | |
| 18:01 | Fix the assert()s in the byte-code engine that prove that cursors are unidirectional. Closed-Leaf check-in: 4b0b4e14 user: drh tags: multikey-opt-idea | |
| 17:32 | Remove the NextIfOpen and PrevIfOpen opcodes which are no longer needed when the IN-early-out optimization is working. check-in: 439c8162 user: drh tags: multikey-opt-idea | |
Changes
Changes to src/vdbe.c.
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case OP_NotExists: /* jump, in3 */ pIn3 = &aMem[pOp->p3]; assert( pIn3->flags & MEM_Int ); assert( pOp->p1>=0 && pOp->p1<p->nCursor ); pC = p->apCsr[pOp->p1]; assert( pC!=0 ); #ifdef SQLITE_DEBUG pC->seekOp = 0; #endif assert( pC->isTable ); assert( pC->eCurType==CURTYPE_BTREE ); pCrsr = pC->uc.pCursor; assert( pCrsr!=0 ); res = 0; iKey = pIn3->u.i; ................................................................................ assert( pC!=0 ); pC->nullRow = 1; pC->cacheStatus = CACHE_STALE; if( pC->eCurType==CURTYPE_BTREE ){ assert( pC->uc.pCursor!=0 ); sqlite3BtreeClearCursor(pC->uc.pCursor); } break; } /* Opcode: SeekEnd P1 * * * * ** ** Position cursor P1 at the end of the btree for the purpose of ** appending a new entry onto the btree. ................................................................................ pC = p->apCsr[pOp->p1]; assert( pC!=0 ); assert( pC->deferredMoveto==0 ); assert( pC->eCurType==CURTYPE_BTREE ); assert( pOp->opcode!=OP_Next || pOp->p4.xAdvance==sqlite3BtreeNext ); assert( pOp->opcode!=OP_Prev || pOp->p4.xAdvance==sqlite3BtreePrevious ); #if 0 /* The Next opcode is only used after SeekGT, SeekGE, and Rewind. ** The Prev opcode is only used after SeekLT, SeekLE, and Last. */ assert( pOp->opcode!=OP_Next || pC->seekOp==OP_SeekGT || pC->seekOp==OP_SeekGE || pC->seekOp==OP_Rewind || pC->seekOp==OP_Found); assert( pOp->opcode!=OP_Prev || pC->seekOp==OP_SeekLT || pC->seekOp==OP_SeekLE || pC->seekOp==OP_Last ); #endif rc = pOp->p4.xAdvance(pC->uc.pCursor, pOp->p3); next_tail: pC->cacheStatus = CACHE_STALE; VdbeBranchTaken(rc==SQLITE_OK,2); if( rc==SQLITE_OK ){ pC->nullRow = 0; |
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4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 .... 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 .... 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 |
case OP_NotExists: /* jump, in3 */ pIn3 = &aMem[pOp->p3]; assert( pIn3->flags & MEM_Int ); assert( pOp->p1>=0 && pOp->p1<p->nCursor ); pC = p->apCsr[pOp->p1]; assert( pC!=0 ); #ifdef SQLITE_DEBUG pC->seekOp = OP_SeekRowid; #endif assert( pC->isTable ); assert( pC->eCurType==CURTYPE_BTREE ); pCrsr = pC->uc.pCursor; assert( pCrsr!=0 ); res = 0; iKey = pIn3->u.i; ................................................................................ assert( pC!=0 ); pC->nullRow = 1; pC->cacheStatus = CACHE_STALE; if( pC->eCurType==CURTYPE_BTREE ){ assert( pC->uc.pCursor!=0 ); sqlite3BtreeClearCursor(pC->uc.pCursor); } #ifdef SQLITE_DEBUG if( pC->seekOp==0 ) pC->seekOp = OP_NullRow; #endif break; } /* Opcode: SeekEnd P1 * * * * ** ** Position cursor P1 at the end of the btree for the purpose of ** appending a new entry onto the btree. ................................................................................ pC = p->apCsr[pOp->p1]; assert( pC!=0 ); assert( pC->deferredMoveto==0 ); assert( pC->eCurType==CURTYPE_BTREE ); assert( pOp->opcode!=OP_Next || pOp->p4.xAdvance==sqlite3BtreeNext ); assert( pOp->opcode!=OP_Prev || pOp->p4.xAdvance==sqlite3BtreePrevious ); /* The Next opcode is only used after SeekGT, SeekGE, Rewind, and Found. ** The Prev opcode is only used after SeekLT, SeekLE, and Last. */ assert( pOp->opcode!=OP_Next || pC->seekOp==OP_SeekGT || pC->seekOp==OP_SeekGE || pC->seekOp==OP_Rewind || pC->seekOp==OP_Found || pC->seekOp==OP_NullRow); assert( pOp->opcode!=OP_Prev || pC->seekOp==OP_SeekLT || pC->seekOp==OP_SeekLE || pC->seekOp==OP_Last || pC->seekOp==OP_NullRow); rc = pOp->p4.xAdvance(pC->uc.pCursor, pOp->p3); next_tail: pC->cacheStatus = CACHE_STALE; VdbeBranchTaken(rc==SQLITE_OK,2); if( rc==SQLITE_OK ){ pC->nullRow = 0; |