gkodinov/kgeorge@magare.gmz cfaa0983c8 Bug #30377: EXPLAIN loses last_query_cost when used with UNION ...

Currently the Last_query_cost session status variable shows
only the cost of a single flat subselect. For complex queries
(with subselects or unions etc) Last_query_cost is not valid
as it was showing the cost for the last optimized subselect.
Fixed by reseting to zero Last_query_cost when the complete
cost of the query cannot be determined.
Last_query_cost will be non-zero only for single flat queries.

2007-08-28 18:51:03 +03:00

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