QUERY_CACHE_INFO plugin

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MariaDB starting with 5.5.31

This plugin was first released in MariaDB 5.5.31

The QUERY_CACHE_INFO plugin allows you to see the contents of the query cache. It creates the QUERY_CACHE_INFO table in the INFORMATION_SCHEMA database that shows all queries that are in the cache. You must have the PROCESS privilege (see GRANT) to use this table.

select statement_schema, statement_text, result_blocks_count, 
  result_blocks_size from information_schema.query_cache_info;
+------------------+------------------+---------------------+--------------------+
| statement_schema | statement_text   | result_blocks_count | result_blocks_size |
+------------------+------------------+---------------------+--------------------+
| test             | select * from t1 |                   1 |                512 |
+------------------+------------------+---------------------+--------------------+

New features will be implemented with MDEV-4682

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