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Overview
| Comment: | Small performance optimization in sqlite3VdbeRecordCompareWithSkip() for the common case where the comparison is equal. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
1e616e256a4fb1b64271706fdfa77dc5 |
| User & Date: | drh 2018-06-06 20:29:19 |
Context
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2018-06-06
| ||
| 20:55 | More space and performance enhancements to sqlite3VdbeRecordCompare(). check-in: 83a60ff0 user: drh tags: trunk | |
| 20:29 | Small performance optimization in sqlite3VdbeRecordCompareWithSkip() for the common case where the comparison is equal. check-in: 1e616e25 user: drh tags: trunk | |
| 19:48 | Rearrange the order of some checks in the integrity_check pragma for a very slight performance gain. check-in: 4b853f02 user: drh tags: trunk | |
Changes
Changes to src/vdbeaux.c.
4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 |
}
assert( vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, rc) );
assert( mem1.szMalloc==0 ); /* See comment below */
return rc;
}
i++;
pRhs++;
d1 += sqlite3VdbeSerialTypeLen(serial_type);
idx1 += sqlite3VarintLen(serial_type);
}while( idx1<(unsigned)szHdr1 && i<pPKey2->nField && d1<=(unsigned)nKey1 );
/* No memory allocation is ever used on mem1. Prove this using
** the following assert(). If the assert() fails, it indicates a
** memory leak and a need to call sqlite3VdbeMemRelease(&mem1). */
assert( mem1.szMalloc==0 );
/* rc==0 here means that one or both of the keys ran out of fields and
|
> | |
4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 |
}
assert( vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, rc) );
assert( mem1.szMalloc==0 ); /* See comment below */
return rc;
}
i++;
if( i==pPKey2->nField ) break;
pRhs++;
d1 += sqlite3VdbeSerialTypeLen(serial_type);
idx1 += sqlite3VarintLen(serial_type);
}while( idx1<(unsigned)szHdr1 && d1<=(unsigned)nKey1 );
/* No memory allocation is ever used on mem1. Prove this using
** the following assert(). If the assert() fails, it indicates a
** memory leak and a need to call sqlite3VdbeMemRelease(&mem1). */
assert( mem1.szMalloc==0 );
/* rc==0 here means that one or both of the keys ran out of fields and
|