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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.
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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
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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.
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*/
}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.
|
> > > > > > > > > |
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*/
}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.
|