MDEV-32083 INSERT..SELECT crashes if target table appears in a derive… #3924
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…d table within the SELECT clause The cause if the problem is an outdated value of `JOIN::tmp_table_param::field_count` after derived table materialization. `JOIN::tmp_table_param` is initialized during `count_field_types()` (join preparation phase). A derived table may be marked as merged at this point, but later it may be forced to materialization. Materialized derived table provides other values for `JOIN::tmp_table_param`, so it is necessary to re-calculate them after switch to materialization
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…d table within the SELECT clause
Description
The cause if the problem is an outdated value of
JOIN::tmp_table_param::field_countafter derived table materialization.JOIN::tmp_table_paramis initialized duringcount_field_types()(join preparation phase). A derived table may be marked as merged at this point, but later it may be forced to materialization. Materialized derived table provides other values forJOIN::tmp_table_param, so it is necessary to re-calculate them after switch to materializationRelease Notes
How can this PR be tested?
./mtr insert_selectBasing the PR against the correct MariaDB version
mainbranch.PR quality check