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Overview
| Comment: | If a reprepare is needed after binding to a variable with a number larger than 32, set only the high-order bit of the Vdbe.expmask rather than setting all bits. This could potentially result in fewer false-positive reprepares. |
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| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
45797feefe90cb7da53256b0c42fdaa1 |
| User & Date: | drh 2017-03-03 21:51:40.099 |
Context
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2017-03-06
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| 17:33 | Add an initial implementation of the "PRAGMA optimize" command. (check-in: 137aeb2b16 user: drh tags: trunk) | |
| 11:39 | Merge updates from trunk. (Closed-Leaf check-in: 5f7fc79aa0 user: drh tags: auto-analyze) | |
|
2017-03-03
| ||
| 21:51 | If a reprepare is needed after binding to a variable with a number larger than 32, set only the high-order bit of the Vdbe.expmask rather than setting all bits. This could potentially result in fewer false-positive reprepares. (check-in: 45797feefe user: drh tags: trunk) | |
| 21:36 | Remove an redundant function call from the date/time function implementation. (check-in: 4a04c48a31 user: drh tags: trunk) | |
Changes
Changes to src/vdbeapi.c.
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1256 1257 1258 1259 1260 1261 1262 | ** IMPLEMENTATION-OF: R-48440-37595 If the specific value bound to host ** parameter in the WHERE clause might influence the choice of query plan ** for a statement, then the statement will be automatically recompiled, ** as if there had been a schema change, on the first sqlite3_step() call ** following any change to the bindings of that parameter. */ assert( p->isPrepareV2 || p->expmask==0 ); | | | 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 |
** IMPLEMENTATION-OF: R-48440-37595 If the specific value bound to host
** parameter in the WHERE clause might influence the choice of query plan
** for a statement, then the statement will be automatically recompiled,
** as if there had been a schema change, on the first sqlite3_step() call
** following any change to the bindings of that parameter.
*/
assert( p->isPrepareV2 || p->expmask==0 );
if( p->expmask!=0 && (p->expmask & (i>=31 ? 0x80000000 : (u32)1<<i))!=0 ){
p->expired = 1;
}
return SQLITE_OK;
}
/*
** Bind a text or BLOB value.
|
| ︙ | ︙ |
Changes to src/vdbeaux.c.
| ︙ | ︙ | |||
4548 4549 4550 4551 4552 4553 4554 |
/*
** Configure SQL variable iVar so that binding a new value to it signals
** to sqlite3_reoptimize() that re-preparing the statement may result
** in a better query plan.
*/
void sqlite3VdbeSetVarmask(Vdbe *v, int iVar){
assert( iVar>0 );
| | | | 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 |
/*
** Configure SQL variable iVar so that binding a new value to it signals
** to sqlite3_reoptimize() that re-preparing the statement may result
** in a better query plan.
*/
void sqlite3VdbeSetVarmask(Vdbe *v, int iVar){
assert( iVar>0 );
if( iVar>=32 ){
v->expmask |= 0x80000000;
}else{
v->expmask |= ((u32)1 << (iVar-1));
}
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
|
| ︙ | ︙ |