Added test case for bug #11867.
Fixed results for two existing test cases.
subselect.test:
Added test case for bug #11867.
item_subselect.cc:
Fixed bug #11867.
Added missing code in Item_in_subselect::row_value_transformer
that caused problems for queries with
ROW(elems) IN (SELECT DISTINCT cols FROM ...).
When creating temporary table for UNION, pass TMP_TABLE_FORCE_MYISAM flag to
create_tmp_table if we will be using fulltext function(s) when reading from the
temp. table.
item.cc:
item.h:
Adding Item_param::safe_charset_converter,
not to return collation mix error if
parameter can be converted into operation
character set.
ctype_utf8.result:
adding test case
ctype_utf8.test:
adding test case
length.
When temporary field created for DATE(LEFT(column,8)) expression, max_length
value is taken from Item_date_typecast, and it is getting it from underlaid
Item_func_left and it's max_length is 8 in given expression. And all this
results in stripping last 2 digits.
To Item_date_typecast class added its own fix_length_and_dec() function
that sets max_length value to 10, which is proper for DATE field.
fixing tests accordingly
item.cc:
Bug #10892 user variables not auto cast for comparisons
When mixing strings with different character sets,
and coercibility is the same, we allow conversion
if one character set is superset for other character set.
Added a test case for bug #12095.
sql_class.h:
Fixed bug #12095: a join query with GROUP_CONCAT over a single row table.
Added a flag to the TMP_TABLE_PARAM class forcing to put constant
items generated after elimination of a single row table into temp table
in some cases (e.g. when GROUP_CONCAT is calculated over a single row
table).
bk ci sql/item_sum.cc
Fixed bug #12095: a join query with GROUP_CONCAT over a single row table.
If GROUP_CONCAT is calculated we always put its argument into a temp
table, even when the argument is a constant item.
sql_select.cc:
Fixed bug #12095: a join query with GROUP_CONCAT over one row table.
If temp table is used to calculate GROUP_CONCAT the argument should
be always put into this table, even when it is a constant item.
Fixed bug #12144.
Added an optimization that avoids key access with null keys for the 'ref'
method when used in outer joins. The regilar optimization with adding
IS NOT NULL expressions is not applied for outer join on expressions as
the predicates of these expressions are not pushed down in 4.1.
null_key.result, null_key.test:
Added a test case for bug #12144.
