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Overview
| Comment: | The OP_Column opcode runs faster and is smaller by manually in-lining the code that persists string values in the output register. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
36b613ccf0ddb764af90841994da91b7 |
| User & Date: | drh 2014-09-19 15:28:33 |
References
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2014-11-05
| ||
| 14:53 | • New ticket [094d39a4] Assertion fault on CREATE TABLE ... AS SELECT .... (artifact: b5f433e5 user: drh) | |
Context
|
2014-09-19
| ||
| 16:02 | Updates to comments. No code changes. (check-in: 9b42c3da user: drh tags: trunk) | |
| 15:28 | The OP_Column opcode runs faster and is smaller by manually in-lining the code that persists string values in the output register. (check-in: 36b613cc user: drh tags: trunk) | |
| 04:42 | Add the sqlite3VdbeMemClearAndResize() function. Fix a sorting-index prefilter problem. (check-in: 987a7a21 user: drh tags: trunk) | |
Changes
Changes to src/vdbe.c.
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sqlite3VdbeSerialGet((const u8*)pDest->z, t, pDest);
pDest->flags &= ~MEM_Ephem;
}
}
pDest->enc = encoding;
op_column_out:
Deephemeralize(pDest);
op_column_error:
UPDATE_MAX_BLOBSIZE(pDest);
REGISTER_TRACE(pOp->p3, pDest);
break;
}
/* Opcode: Affinity P1 P2 * P4 *
|
| > > > > > > > > > > > > > > |
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sqlite3VdbeSerialGet((const u8*)pDest->z, t, pDest);
pDest->flags &= ~MEM_Ephem;
}
}
pDest->enc = encoding;
op_column_out:
/* If the column value is an ephemeral string, go ahead and persist
** that string in case the cursor moves before the column value is
** used. The following code does the equivalent of Deephemeralize()
** but does it faster. */
if( (pDest->flags & MEM_Ephem)!=0 && pDest->z ){
u16 f = pDest->flags & (MEM_Str|MEM_Blob);
assert( f!=0 );
zData = (const u8*)pDest->z;
len = pDest->n;
if( sqlite3VdbeMemClearAndResize(pDest, len+2) ) goto no_mem;
memcpy(pDest->z, zData, len);
pDest->z[len] = 0;
pDest->z[len+1] = 0;
pDest->flags = f|MEM_Term;
}
op_column_error:
UPDATE_MAX_BLOBSIZE(pDest);
REGISTER_TRACE(pOp->p3, pDest);
break;
}
/* Opcode: Affinity P1 P2 * P4 *
|