Sergey Petrunya 422c55a240 MDEV-5037: Server crash on a JOIN on a derived table with join_cache_level > 2 ...

- The crash was caused because the optimizer called handler->multi_range_read_info()
  on a derived temporary table.  That table has been created, but not opened yet.
  Because of that, handler::table was NULL, which caused crash.
  Fixed by changing DS-MRR methods to use handler::table_share instead. 
  handler::table_share is set in handler ctor, so this should be safe.

2013-09-20 14:47:38 +04:00

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