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  1. MariaDB Server
  2. MDEV-6977

SET STATEMENT query_cache_type apparently has no effect and hence should be disallowed

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      From all I see, SET STATEMENT ... FOR SELECT queries are not put in the query cache and do not use it, whatever parameters are.

      Then, SET STATEMENT query_cache_type = ... can't have any effect, and thus should be disabled with ER_SET_STATEMENT_NOT_SUPPORTED. Same is probably true for other query_cache_* variables potentially changeable in SET STATEMENT context (query_cache_strip_comments? query_cache_wlock_invalidate?).

      In Percona server it looks even worse, SET STATEMENT .. queries are put into the query cache, but never hit it.

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              Assignee:
              sanja Oleksandr Byelkin
              Reporter:
              elenst Elena Stepanova
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