Georgi Kodinov a8ae3cd6e9 Bug #52711: Segfault when doing EXPLAIN SELECT with ...

union...order by (select... where...)

The problem is mysql is trying to materialize and 
cache the scalar sub-queries at JOIN::optimize
even for EXPLAIN where the number of columns is 
totally different from what's expected.
Fixed by not executing the scalar subqueries 
for EXPLAIN.

2010-04-15 17:04:24 +03:00

128 KiB

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