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Fixed bug #18206.

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The bug report revealed two problems related to min/max optimization:
1. If the length of a constant key used in a SARGable condition for
for the MIN/MAX fields is greater than the length of the field an 
unwanted warning on key truncation is issued;
2. If MIN/MAX optimization is applied to a partial index, like INDEX(b(4))
than can lead to returning a wrong result set.


mysql-test/r/func_group.result:
  Added test cases for bug #18206.
mysql-test/t/func_group.test:
  Added test cases for bug #18206.
sql/opt_sum.cc:
  Fixed bug #18206.
  Suppressed the warning about data truncation when store_val_in_field
  was used to store keys for the field used in MIN/MAX optimization.
  Blocked MIN/MAX optimization for partial keys, such as in INDEX(b(4)).
sql/sql_select.cc:
  Fixed bug #18206.
  Added a parameter for the function store_val_in_field allowing to
  control setting warnings about data truncation in the function.
sql/sql_select.h:
  Fixed bug #18206.
  Added a parameter for the function store_val_in_field allowing to
  control setting warnings about data truncation in the function.
This commit is contained in:
unknown
2006-06-02 14:14:57 -07:00
parent a9824f263d
commit e3e0658779
5 changed files with 61 additions and 7 deletions
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2
sql/sql_select.h
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@@ -335,7 +335,7 @@ extern const char *join_type_str[];
void TEST_join(JOIN *join);
/* Extern functions in sql_select.cc */
bool store_val_in_field(Field *field,Item *val);
bool store_val_in_field(Field *field, Item *val, enum_check_fields check_flag);
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,