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MDEV-5037: Server crash on a JOIN on a derived table with join_cache_level > 2

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- 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.
This commit is contained in:
Sergey Petrunya 2013-09-20 14:47:38 +04:00
commit 422c55a240
6 changed files with 65 additions and 12 deletions
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2
sql/opt_subselect.h
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@ -192,7 +192,7 @@ public:
(PREV_BITS(key_part_map, max_loose_keypart+1) & // (3)
(found_part | loose_scan_keyparts)) == // (3)
PREV_BITS(key_part_map, max_loose_keypart+1) && // (3)
!key_uses_partial_cols(s->table, key))
!key_uses_partial_cols(s->table->s, key))
{
/* Ok, can use the strategy */
part1_conds_met= TRUE;