05b98ae603
* Fixed bugs: Illegal mix of collations
* Problem: comparison of a DATETIME sp variable and NOW() led to Illegal mix of
collations error when character_set_connection=utf8.
* Error happened in Arg_comparator::set_compare_func(), because the first
argument was errouneously converted to utf8, while the second argument was
not.
* Fix: separate agg_arg_charsets_for_comparison() into two functions:
- agg_arg_charsets_for_comparison() - for pure comparison, when we don't need
to return any string result and therefore don't need to convert arguments
to @@character_set_connection:
SELECT a = b;
- agg_arg_charsets_for_string_results_with_comparison() - when we need to
return a string result, but we also need to do comparison internally:
SELECT REPLACE(a,b,c)
If all arguments are numbers:
SELECT REPLACE(123,2,3) -> 133
we convert arguments to @@character_set_connection.
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