Bug#23451 GROUP_CONCAT truncates a multibyte utf8 character
Problem: GROUP_CONCAT on a multi-byte column can truncate in the middle of a multibyte character when applying group_concat_max_len limit. It produces an invalid multi-byte character in the result string. The second, easier version - reusing old "warning_for_row" flag, instead of introducing of "result_is_full" - which was added in the previous commit. mysql-test/r/func_gconcat.result: Adding test case mysql-test/t/func_gconcat.test: Adding test case sql/item_sum.cc: Adding well_formed_len() call not to cut in the middle of a multi-byte character.
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