Georgi Kodinov 35d865f2fe Bug #12408412: GROUP_CONCAT + ORDER BY + INPUT/OUTPUT SAME ...

USER VARIABLE = CRASH

Moved the preparation of the variables that receive the output from 
SELECT INTO from execution time (JOIN:execute) to compile time 
(JOIN::prepare). This ensures that if the same variable is used in the
SELECT part of SELECT INTO it will be properly marked as non-const
for this query.
Test case added.
Used proper fast iterator.

2012-03-09 15:04:49 +02:00

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