Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
| Comment: | Improved WHERETRACE messages for the estimated output row reductions from range scans. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
fdd478bb11eb9e244a7a1fb628ac27c5 |
| User & Date: | drh 2014-08-28 19:38:22 |
Context
|
2014-08-29
| ||
| 14:20 | Not a fault after all, rather a testing mistake. Move this change back to trunk. Was: Avoid an unnecessary OP_Move operation for expression subqueries. check-in: 2a74129a user: drh tags: trunk | |
| 12:29 | Contains a fault. Was: Avoid an unnecessary OP_Move operation for expression subqueries. Closed-Leaf check-in: 462f42af user: drh tags: mistake | |
| 11:24 | Add the sqlite3VdbeChangeDest() routine that can be used to eliminate OP_Move opcodes. Closed-Leaf check-in: 8c57bcc3 user: drh tags: experimental | |
|
2014-08-28
| ||
| 19:38 | Improved WHERETRACE messages for the estimated output row reductions from range scans. check-in: fdd478bb user: drh tags: trunk | |
| 17:30 | Fix a problem causing an inaccurate stat4-based estimate for the number of rows visited by a range scan. check-in: a9daf3ac user: drh tags: trunk | |
Changes
Changes to src/where.c.
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
....
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
|
nNew = sqlite3LogEst(iUpper - iLower);
}else{
nNew = 10; assert( 10==sqlite3LogEst(2) );
}
if( nNew<nOut ){
nOut = nNew;
}
WHERETRACE(0x10, ("range scan regions: %u..%u est=%d\n",
(u32)iLower, (u32)iUpper, nOut));
}
}else{
int bDone = 0;
rc = whereRangeSkipScanEst(pParse, pLower, pUpper, pLoop, &bDone);
if( bDone ) return rc;
}
................................................................................
** index. While a closed range (e.g. col BETWEEN ? AND ?) is estimated to
** match 1/64 of the index. */
if( pLower && pUpper ) nNew -= 20;
nOut -= (pLower!=0) + (pUpper!=0);
if( nNew<10 ) nNew = 10;
if( nNew<nOut ) nOut = nNew;
pLoop->nOut = (LogEst)nOut;
return rc;
}
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
/*
** Estimate the number of rows that will be returned based on
|
|
>
>
>
>
>
>
|
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
....
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
|
nNew = sqlite3LogEst(iUpper - iLower);
}else{
nNew = 10; assert( 10==sqlite3LogEst(2) );
}
if( nNew<nOut ){
nOut = nNew;
}
WHERETRACE(0x10, ("STAT4 range scan: %u..%u est=%d\n",
(u32)iLower, (u32)iUpper, nOut));
}
}else{
int bDone = 0;
rc = whereRangeSkipScanEst(pParse, pLower, pUpper, pLoop, &bDone);
if( bDone ) return rc;
}
................................................................................
** index. While a closed range (e.g. col BETWEEN ? AND ?) is estimated to
** match 1/64 of the index. */
if( pLower && pUpper ) nNew -= 20;
nOut -= (pLower!=0) + (pUpper!=0);
if( nNew<10 ) nNew = 10;
if( nNew<nOut ) nOut = nNew;
#if defined(WHERETRACE_ENABLED)
if( pLoop->nOut>nOut ){
WHERETRACE(0x10,("Range scan lowers nOut from %d to %d\n",
pLoop->nOut, nOut));
}
#endif
pLoop->nOut = (LogEst)nOut;
return rc;
}
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
/*
** Estimate the number of rows that will be returned based on
|