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Overview
| Comment: | Size and performance optimization to sqlite3ValueFromExpr() |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
945f82bc44c5a431c0fef0d36cf01667 |
| User & Date: | drh 2016-09-29 19:27:16 |
Context
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2016-09-29
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| 19:50 | Remove the peep-hole optimization of removing OP_Close opcodes that come before OP_Halt, as the extra work of removing those opcodes uses more cycles than just running them. check-in: 984a96d7 user: drh tags: trunk | |
| 19:27 | Size and performance optimization to sqlite3ValueFromExpr() check-in: 945f82bc user: drh tags: trunk | |
| 15:53 | Clarification and typo-fixes in comments. No changes to code. check-in: e2cd79aa user: drh tags: trunk | |
Changes
Changes to src/vdbemem.c.
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int op; char *zVal = 0; sqlite3_value *pVal = 0; int negInt = 1; const char *zNeg = ""; int rc = SQLITE_OK; if( !pExpr ){ *ppVal = 0; return SQLITE_OK; } while( (op = pExpr->op)==TK_UPLUS || op==TK_SPAN ) pExpr = pExpr->pLeft; if( NEVER(op==TK_REGISTER) ) op = pExpr->op2; /* Compressed expressions only appear when parsing the DEFAULT clause ** on a table column definition, and hence only when pCtx==0. This ** check ensures that an EP_TokenOnly expression is never passed down ** into valueFromFunction(). */ ................................................................................ int sqlite3ValueFromExpr( sqlite3 *db, /* The database connection */ Expr *pExpr, /* The expression to evaluate */ u8 enc, /* Encoding to use */ u8 affinity, /* Affinity to use */ sqlite3_value **ppVal /* Write the new value here */ ){ return valueFromExpr(db, pExpr, enc, affinity, ppVal, 0); } #ifdef SQLITE_ENABLE_STAT3_OR_STAT4 /* ** The implementation of the sqlite_record() function. This function accepts ** a single argument of any type. The return value is a formatted database ** record (a blob) containing the argument value. |
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int op; char *zVal = 0; sqlite3_value *pVal = 0; int negInt = 1; const char *zNeg = ""; int rc = SQLITE_OK; assert( pExpr!=0 ); while( (op = pExpr->op)==TK_UPLUS || op==TK_SPAN ) pExpr = pExpr->pLeft; if( NEVER(op==TK_REGISTER) ) op = pExpr->op2; /* Compressed expressions only appear when parsing the DEFAULT clause ** on a table column definition, and hence only when pCtx==0. This ** check ensures that an EP_TokenOnly expression is never passed down ** into valueFromFunction(). */ ................................................................................ int sqlite3ValueFromExpr( sqlite3 *db, /* The database connection */ Expr *pExpr, /* The expression to evaluate */ u8 enc, /* Encoding to use */ u8 affinity, /* Affinity to use */ sqlite3_value **ppVal /* Write the new value here */ ){ return pExpr ? valueFromExpr(db, pExpr, enc, affinity, ppVal, 0) : 0; } #ifdef SQLITE_ENABLE_STAT3_OR_STAT4 /* ** The implementation of the sqlite_record() function. This function accepts ** a single argument of any type. The return value is a formatted database ** record (a blob) containing the argument value. |