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| author | unknown <evgen@moonbone.local> | 2006-01-13 12:13:50 +0300 |
|---|---|---|
| committer | unknown <evgen@moonbone.local> | 2006-01-13 12:13:50 +0300 |
| commit | a8a4a22974fc95016248016e9b7836a2460bcef0 (patch) | |
| tree | a6574ee59fca9abfbe8e3879ca60ea6046ed93be /sql/item_cmpfunc.h | |
| parent | 891202f7d1c79200da23f4df8a19d9cd1c550a2b (diff) | |
| parent | 593bed0d929cdc2827439d4697ce6f4b2bc9d941 (diff) | |
| download | mariadb-git-a8a4a22974fc95016248016e9b7836a2460bcef0.tar.gz | |
Merge
sql/item_cmpfunc.cc:
Auto merged
sql/item_cmpfunc.h:
Auto merged
mysql-test/r/select.result:
SCCS merged
mysql-test/t/select.test:
SCCS merged
Diffstat (limited to 'sql/item_cmpfunc.h')
| -rw-r--r-- | sql/item_cmpfunc.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sql/item_cmpfunc.h b/sql/item_cmpfunc.h index b4064fb45b8..98ccefd08ab 100644 --- a/sql/item_cmpfunc.h +++ b/sql/item_cmpfunc.h @@ -1150,6 +1150,11 @@ public: are deleted in the end of execution. All changes made to these objects need not be registered in the list of changes of the parse tree and do not harm PS/SP re-execution. + + Item equal objects are employed only at the optimize phase. Usually they are + not supposed to be evaluated. Yet in some cases we call the method val_int() + for them. We have to take care of restricting the predicate such an + object represents f1=f2= ...=fn to the projection of known fields fi1=...=fik. */ class Item_equal: public Item_bool_func |