Sergei Petrunia b4abe7c91f
MDEV-22993: Crash on EXPLAIN with PUSHED DOWN SELECT and subquery ...
- select_describe() should not attempt to produce query plans
for subqueries if the query is handled by a Select Handler.
- JOIN::save_explain_data_intern should not add links to Explain_select
for children selects if:
1. The whole query is handled by the Select Handler, or
2. this select (and so its children) is handled by Derived Handler.
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