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MDEV-27776 EXPLAIN is about to get new columns, EXPLAIN EXTENDED|PARTITIONS will be deprecated

 

* EXPLAIN SELECT prints "partitions", "filtered" columns and produces the
warning with rewritten query
* EXPLAIN EXTENDED and EXPLAIN PARTITIONS produce the same output as
EXPLAIN SELECT and two warnings, the second warning is about EXPLAIN
EXTENDED| PARTITIONS being deprecated (same as in MySQL 5.7)

-- 
Best regards,
-------------------------
*Oleg Smirnov*
Sr. Software Engineer
MariaDB Server Team