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Merge mysql.com:/home/ram/work/mysql-5.0-maint

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into  mysql.com:/home/ram/work/b21976/my50-b21976


sql/item.h:
  Auto merged
mysql-test/r/func_group.result:
  merging
mysql-test/t/func_group.test:
  merging
sql/item_sum.cc:
  merging
This commit is contained in:
unknown 2007-03-29 13:37:07 +05:00
commit 9683b0ae68
4 changed files with 29 additions and 34 deletions
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11
sql/item.h
View file

@ -694,12 +694,11 @@ public:
virtual bool get_date_result(TIME *ltime,uint fuzzydate)
{ return get_date(ltime,fuzzydate); }
/*
This function is used only in Item_func_isnull/Item_func_isnotnull
(implementations of IS NULL/IS NOT NULL clauses). Item_func_is{not}null
calls this method instead of one of val/result*() methods, which
normally will set null_value. This allows to determine nullness of
a complex expression without fully evaluating it.
Any new item which can be NULL must implement this call.
The method allows to determine nullness of a complex expression
without fully evaluating it, instead of calling val/result*() then
checking null_value. Used in Item_func_isnull/Item_func_isnotnull
and Item_sum_count/Item_sum_count_distinct.
Any new item which can be NULL must implement this method.
*/
virtual bool is_null() { return 0; }