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Bug#27219: Aggregate functions in ORDER BY.

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Mixing aggregate functions and non-grouping columns is not allowed in the
ONLY_FULL_GROUP_BY mode. However in some cases the error wasn't thrown because
of insufficient check.

In order to check more thoroughly the new algorithm employs a list of outer
fields used in a sum function and a SELECT_LEX::full_group_by_flag.
Each non-outer field checked to find out whether it's aggregated or not and
the current select is marked accordingly.
All outer fields that are used under an aggregate function are added to the
Item_sum::outer_fields list and later checked by the Item_sum::check_sum_func
function.
This commit is contained in:
evgen@moonbone.local
2008-03-27 19:49:32 +03:00
parent 3a87bbfe42
commit 21c6145a6e
10 changed files with 395 additions and 36 deletions
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11
sql/sql_lex.h
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@ -611,7 +611,16 @@ public:
joins on the right.
*/
List<String> *prev_join_using;
/*
Bitmap used in the ONLY_FULL_GROUP_BY_MODE to prevent mixture of aggregate
functions and non aggregated fields when GROUP BY list is absent.
Bits:
0 - non aggregated fields are used in this select,
defined as NON_AGG_FIELD_USED.
1 - aggregate functions are used in this select,
defined as SUM_FUNC_USED.
*/
uint8 full_group_by_flag;
void init_query();
void init_select();
st_select_lex_unit* master_unit();