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  1. MariaDB Server
  2. MDEV-36463

Rename expression_cache to subquery_cache

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      (Filing based on input from Monty)

      Optimizer_switch has subquery_cache=on|off flag.

      EXPLAIN FORMAT=JSON shows "subquery_cache" as expression_cache.

      I guess it's because the cache could handle other expressions also. Currently
      it only handles subqueries, though.

      This task is to rename "expression_cache" to "subquery_cache".

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            bsrikanth Srikanth Bondalapati
            psergei Sergei Petrunia
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