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Overview
| Comment: | When doing a REPLACE on a WITHOUT ROWID table with no secondary indexes, bypass the OP_NoConflict/OP_Delete sequence and directly overwrite any preexisting row, for a performance increase. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | unpacked-IdxInsert |
| Files: | files | file ages | folders |
| SHA1: |
f7041cbb63b912f9ecad538804b6f238 |
| User & Date: | drh 2016-11-10 17:01:36 |
Context
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2016-11-10
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| 20:42 | Avoid a few unnecessary calls to sqlite3BtreeMovetoUnpacked(). check-in: eac0e827 user: drh tags: unpacked-IdxInsert | |
| 17:01 | When doing a REPLACE on a WITHOUT ROWID table with no secondary indexes, bypass the OP_NoConflict/OP_Delete sequence and directly overwrite any preexisting row, for a performance increase. check-in: f7041cbb user: drh tags: unpacked-IdxInsert | |
| 16:07 | Remove C++ style comments. No code changes. check-in: 42f8aa62 user: drh tags: unpacked-IdxInsert | |
Changes
Changes to src/insert.c.
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continue; /* pIdx is not a UNIQUE index */
}
if( overrideError!=OE_Default ){
onError = overrideError;
}else if( onError==OE_Default ){
onError = OE_Abort;
}
/* Check to see if the new index entry will be unique */
sqlite3VdbeAddOp4Int(v, OP_NoConflict, iThisCur, addrUniqueOk,
regIdx, pIdx->nKeyCol); VdbeCoverage(v);
/* Generate code to handle collisions */
regR = (pIdx==pPk) ? regIdx : sqlite3GetTempRange(pParse, nPkField);
................................................................................
if( aRegIdx[i]==0 ) continue;
bAffinityDone = 1;
if( pIdx->pPartIdxWhere ){
sqlite3VdbeAddOp2(v, OP_IsNull, aRegIdx[i], sqlite3VdbeCurrentAddr(v)+2);
VdbeCoverage(v);
}
sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iIdxCur+i, aRegIdx[i],
aRegIdx[i]+1, pIdx->nColumn);
pik_flags = 0;
if( useSeekResult ) pik_flags = OPFLAG_USESEEKRESULT;
if( IsPrimaryKeyIndex(pIdx) && !HasRowid(pTab) ){
assert( pParse->nested==0 );
pik_flags |= OPFLAG_NCHANGE;
}
sqlite3VdbeChangeP5(v, pik_flags);
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continue; /* pIdx is not a UNIQUE index */
}
if( overrideError!=OE_Default ){
onError = overrideError;
}else if( onError==OE_Default ){
onError = OE_Abort;
}
if( ix==0 && pPk==pIdx && onError==OE_Replace && pPk->pNext==0 ){
sqlite3VdbeResolveLabel(v, addrUniqueOk);
continue;
}
/* Check to see if the new index entry will be unique */
sqlite3VdbeAddOp4Int(v, OP_NoConflict, iThisCur, addrUniqueOk,
regIdx, pIdx->nKeyCol); VdbeCoverage(v);
/* Generate code to handle collisions */
regR = (pIdx==pPk) ? regIdx : sqlite3GetTempRange(pParse, nPkField);
................................................................................
if( aRegIdx[i]==0 ) continue;
bAffinityDone = 1;
if( pIdx->pPartIdxWhere ){
sqlite3VdbeAddOp2(v, OP_IsNull, aRegIdx[i], sqlite3VdbeCurrentAddr(v)+2);
VdbeCoverage(v);
}
sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iIdxCur+i, aRegIdx[i],
aRegIdx[i]+1,
pIdx->uniqNotNull ? pIdx->nKeyCol: pIdx->nColumn);
pik_flags = 0;
if( useSeekResult ) pik_flags = OPFLAG_USESEEKRESULT;
if( IsPrimaryKeyIndex(pIdx) && !HasRowid(pTab) ){
assert( pParse->nested==0 );
pik_flags |= OPFLAG_NCHANGE;
}
sqlite3VdbeChangeP5(v, pik_flags);
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