Sergey Glukhov b195e6f943 Bug#11750518 41090: ORDER BY TRUNCATES GROUP_CONCAT RESULT ...

When temporary tables is used for result sorting
result field for gconcat function is created using
group_concat_max_len size. It leads to result truncation
when character_set_results is multi-byte character set due
to insufficient tmp table field size.
The fix is to increase temporary table field size for
gconcat. Method make_string_field() is overloaded
for Item_func_group_concat class and uses
max_characters * collation.collation->mbmaxlen size for
result field. max_characters is maximum number of characters
what can fit into max_length size.

2011-10-12 17:41:25 +04:00

47 KiB

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