Sergey Petrunya d634638c56 [SHOW] EXPLAIN UPDATE/DELETE, code re-structuring ...

- If a subquery is correlated wrt a const table, it will change from
  being a "DEPENDENT SUBQUERY" into "SUBQUERY", at the end of its parent's 
  JOIN::optimize() call.  Handle this, update the subquery's QPF.
- Make show_explain.test to work
   = "Query plan already deleted" does not happen anymore.
   = Handle special case of queries that don't have top-level selects, like 
     SET x = (SELECT ...)

2013-06-27 18:52:47 +04:00

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