Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
| Comment: | Faster implementation of sqlite3IsBinary(). |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | propagate-const-opt |
| Files: | files | file ages | folders |
| SHA3-256: | be05d0db09f43cc3362c28273463d1d2 |
| User & Date: | drh 2018-07-27 18:12:40 |
Context
|
2018-07-27
| ||
| 18:19 | Performance improvement to sqlite3ExprCollSeq(). With this change, the performance of speed-check.sh is within 400,000 cycles of trunk. check-in: a5f86f49 user: drh tags: propagate-const-opt | |
| 18:12 | Faster implementation of sqlite3IsBinary(). check-in: be05d0db user: drh tags: propagate-const-opt | |
| 17:51 | Only run the constant propagation optimization on joins since that is the only scenario where it is useful. This saves prepare time for the common case of a simple query. check-in: 598d6083 user: drh tags: propagate-const-opt | |
Changes
Changes to src/expr.c.
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
....
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
|
if( !pColl ){
pColl = sqlite3ExprCollSeq(pParse, pRight);
}
}
return pColl;
}
/*
** Return true if CollSeq is the default built-in BINARY.
*/
int sqlite3IsBinary(const CollSeq *p){
return p==0 || sqlite3StrICmp(p->zName,sqlite3StrBINARY)==0;
}
/*
** Generate code for a comparison operator.
*/
static int codeCompare(
Parse *pParse, /* The parsing (and code generating) context */
Expr *pLeft, /* The left operand */
Expr *pRight, /* The right operand */
................................................................................
return target;
}
/* Otherwise, fall thru into the TK_COLUMN case */
}
case TK_COLUMN: {
int iTab = pExpr->iTable;
if( ExprHasProperty(pExpr, EP_FixedCol) ){
pExpr = pExpr->pLeft;
goto expr_code_doover;
}
if( iTab<0 ){
if( pParse->iSelfTab<0 ){
/* Generating CHECK constraints or inserting into partial index */
return pExpr->iColumn - pParse->iSelfTab;
}else{
/* Coding an expression that is part of an index where column names
|
<
<
<
<
<
<
<
|
<
|
324
325
326
327
328
329
330
331
332
333
334
335
336
337
....
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
|
if( !pColl ){
pColl = sqlite3ExprCollSeq(pParse, pRight);
}
}
return pColl;
}
/*
** Generate code for a comparison operator.
*/
static int codeCompare(
Parse *pParse, /* The parsing (and code generating) context */
Expr *pLeft, /* The left operand */
Expr *pRight, /* The right operand */
................................................................................
return target;
}
/* Otherwise, fall thru into the TK_COLUMN case */
}
case TK_COLUMN: {
int iTab = pExpr->iTable;
if( ExprHasProperty(pExpr, EP_FixedCol) ){
return sqlite3ExprCodeTarget(pParse, pExpr->pLeft,target);
}
if( iTab<0 ){
if( pParse->iSelfTab<0 ){
/* Generating CHECK constraints or inserting into partial index */
return pExpr->iColumn - pParse->iSelfTab;
}else{
/* Coding an expression that is part of an index where column names
|
Changes to src/main.c.
905 906 907 908 909 910 911 912 913 914 915 916 917 918 |
*/
}else{
rc = nKey1 - nKey2;
}
}
return rc;
}
/*
** Another built-in collating sequence: NOCASE.
**
** This collating sequence is intended to be used for "case independent
** comparison". SQLite's knowledge of upper and lower case equivalents
** extends only to the 26 characters used in the English language.
|
> > > > > > > > > |
905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 |
*/
}else{
rc = nKey1 - nKey2;
}
}
return rc;
}
/*
** Return true if CollSeq is the default built-in BINARY.
*/
int sqlite3IsBinary(const CollSeq *p){
assert( p==0 || p->xCmp!=binCollFunc || p->pUser!=0
|| strcmp(p->zName,"BINARY")==0 );
return p==0 || (p->xCmp==binCollFunc && p->pUser==0);
}
/*
** Another built-in collating sequence: NOCASE.
**
** This collating sequence is intended to be used for "case independent
** comparison". SQLite's knowledge of upper and lower case equivalents
** extends only to the 26 characters used in the English language.
|