Sergei Petrunia feaeb27b69
MDEV-29152: Assertion failed ... upon TO_CHAR with wrong argument ...
Item_func_tochar::check_arguments() didn't check if its arguments
each had one column. Failing to make this check and proceeding would
eventually cause either an assertion failure or the execution would
reach "MY_ASSERT_UNREACHABLE();" which would produce a crash with
a misleading stack trace.
* Fixed Item_func_tochar::check_arguments() to do the required check.
* Also fixed MY_ASSERT_UNREACHABLE() to terminate the program. Just
"executing" __builtin_unreachable() used to cause "undefined results",
which in my experience was a crash with corrupted stack trace.
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feaeb27b69