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Overview
| Comment: | Fix a bug introduced with recent optimizations: The unary minus operator is TK_UMINUS, not TK_MINUS. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
4bd43307090258f8652c995b056101c5 |
| User & Date: | drh 2009-11-19 14:48:41 |
References
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2009-11-19
| ||
| 14:57 | Merge with [4bd4330709]. check-in: 7a46d1eb user: dan tags: fts3-refactor | |
Context
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2009-11-19
| ||
| 15:26 | Merge fts3-refactor into the main trunk. check-in: 551dbe30 user: dan tags: trunk | |
| 14:57 | Merge with [4bd4330709]. check-in: 7a46d1eb user: dan tags: fts3-refactor | |
| 14:48 | Fix a bug introduced with recent optimizations: The unary minus operator is TK_UMINUS, not TK_MINUS. check-in: 4bd43307 user: drh tags: trunk | |
|
2009-11-18
| ||
| 23:01 | Performance improvement by avoiding unnecessary calls to memset(). check-in: 85940468 user: drh tags: trunk | |
Changes
Changes to src/expr.c.
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** be a small performance hit but is otherwise harmless. On the other
** hand, a false negative (returning FALSE when the result could be NULL)
** will likely result in an incorrect answer. So when in doubt, return
** TRUE.
*/
int sqlite3ExprCanBeNull(const Expr *p){
u8 op;
while( p->op==TK_UPLUS || p->op==TK_MINUS ){ p = p->pLeft; }
op = p->op;
if( op==TK_REGISTER ) op = p->op2;
switch( op ){
case TK_INTEGER:
case TK_STRING:
case TK_FLOAT:
case TK_BLOB:
................................................................................
** can be omitted. When in doubt return FALSE. A false negative
** is harmless. A false positive, however, can result in the wrong
** answer.
*/
int sqlite3ExprNeedsNoAffinityChange(const Expr *p, char aff){
u8 op;
if( aff==SQLITE_AFF_NONE ) return 1;
while( p->op==TK_UPLUS || p->op==TK_MINUS ){ p = p->pLeft; }
op = p->op;
if( op==TK_REGISTER ) op = p->op2;
switch( op ){
case TK_INTEGER: {
return aff==SQLITE_AFF_INTEGER || aff==SQLITE_AFF_NUMERIC;
}
case TK_FLOAT: {
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** be a small performance hit but is otherwise harmless. On the other
** hand, a false negative (returning FALSE when the result could be NULL)
** will likely result in an incorrect answer. So when in doubt, return
** TRUE.
*/
int sqlite3ExprCanBeNull(const Expr *p){
u8 op;
while( p->op==TK_UPLUS || p->op==TK_UMINUS ){ p = p->pLeft; }
op = p->op;
if( op==TK_REGISTER ) op = p->op2;
switch( op ){
case TK_INTEGER:
case TK_STRING:
case TK_FLOAT:
case TK_BLOB:
................................................................................
** can be omitted. When in doubt return FALSE. A false negative
** is harmless. A false positive, however, can result in the wrong
** answer.
*/
int sqlite3ExprNeedsNoAffinityChange(const Expr *p, char aff){
u8 op;
if( aff==SQLITE_AFF_NONE ) return 1;
while( p->op==TK_UPLUS || p->op==TK_UMINUS ){ p = p->pLeft; }
op = p->op;
if( op==TK_REGISTER ) op = p->op2;
switch( op ){
case TK_INTEGER: {
return aff==SQLITE_AFF_INTEGER || aff==SQLITE_AFF_NUMERIC;
}
case TK_FLOAT: {
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