Sergey Petrunya 352e848f21 BUG#920132: Assert trx->n_active_thrs == 1 failed at que0que.c line 1050 ...

- MySQL 5.5 introduced caching of constant items by means of 
  wrapping them in Item_cache_XXX objects. If a subquery was wrapped
  in this cache, it could end up being pushed down by ICP.
- The fix is to add Item_cache::walk() which lets ICP to see that 
  the cache item has a subquery inside it, and disable pushdown for this case.

2012-02-21 01:50:50 +04:00

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