Github user gatorsmile commented on the issue: https://github.com/apache/spark/pull/16594 As of MySQL 5.7.3, the EXPLAIN statement is changed so that the effect of the EXTENDED keyword is always enabled. ``` mysql> EXPLAIN EXTENDED -> SELECT t1.a, t1.a IN (SELECT t2.a FROM t2) FROM t1\G *************************** 1. row *************************** id: 1 select_type: PRIMARY table: t1 type: index possible_keys: NULL key: PRIMARY key_len: 4 ref: NULL rows: 4 filtered: 100.00 Extra: Using index *************************** 2. row *************************** id: 2 select_type: SUBQUERY table: t2 type: index possible_keys: a key: a key_len: 5 ref: NULL rows: 3 filtered: 100.00 Extra: Using index 2 rows in set, 1 warning (0.00 sec) ```
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