Fixed bug #20710.
This bug occurs when error message length exceeds allowed limit: my_error() function outputs "%s" sequences instead of long string arguments. Formats like %-.64s are very common in errmsg.txt files, however my_error() function simply ignores precision of those formats. mysys/my_error.c: Fixed bug #20710. This bug occurs when error message length exceeds allowed limit: my_error() function output "%s" sequences instead of long string arguments. my_error() function has been fixed to accept formats like %-.64s. mysql-test/t/alter_table.test: Added test case for bug #20710. mysql-test/r/alter_table.result: Added test case for bug #20710.
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