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Forces a plan to be optimized and generated from scratch the next time it is run.
DROP [plan_id | ALL] FROM PLANCACHE
plan_id- ID of the plan to invalidate. Find by running
ALL- Drop all plans currently in memory, from both the memory and disk plan caches. Note that plans on disk but not in memory are unaffected.
memsql> DROP 123 FROM PLANCACHE; Query OK, 0 rows affected (0.00 sec)