igor@olga.mysql.com 5cbebf0a18 Fixed bug #28728: a crash when executing EXPLAIN EXTENDED for a query ...

using a derived table over a grouping subselect.

This crash happens only when materialization of the derived tables 
requires creation of auxiliary temporary table, for example when
a grouping operation is carried out with usage of a temporary table.

The crash happened because EXPLAIN EXTENDED when printing the query
expression made an attempt to use the objects created in the mem_root
of the temporary table which has been already freed by the moment
when printing is called.

This bug appeared after the method Item_field::print() had been 
introduced.

2007-06-02 11:44:16 -07:00

488 KiB

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