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WL#926 "SUM(DISTINCT) and AVG(DISTINCT)": improvement of SUM(DISTINCT) and

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implementation of AVG(DISTINCT) which utilizes the approach with Fields.
The patch implemented in October is portede to the up-to-date tree 
containing DECIMAL type.
Tests for AVG(DISTINCT) (although there is not much to test provided
that SUM(DISTINCT) works), cleanups for COUNT(DISTINCT) and GROUP_CONCAT()
will follow in another changeset.
This commit is contained in:
konstantin@mysql.com
2005-03-13 23:50:43 +03:00
parent ca336ad1de
commit 983c75f05e
9 changed files with 635 additions and 192 deletions
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sql/sql_select.h
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@ -387,6 +387,7 @@ TABLE *create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
ORDER *group, bool distinct, bool save_sum_fields,
ulong select_options, ha_rows rows_limit,
char* alias);
TABLE *create_virtual_tmp_table(THD *thd, List<create_field> &field_list);
void free_tmp_table(THD *thd, TABLE *entry);
void count_field_types(TMP_TABLE_PARAM *param, List<Item> &fields,
bool reset_with_sum_func);