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MDEV-29284 ANALYZE doesn't work with pushed derived tables
There was no actual execution of the SQL of a pushed derived table, which caused "r_rows" to be always displayed as 0 and "r_total_time_ms" to show inaccurate numbers. This commit makes a derived table SQL to be executed by the storage engine, so the server is able to calculate the number of rows returned and measure the execution time more accurately
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