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MDEV-34041 Display additional information for materialized subqueries in EXPLAIN/ANALYZE FORMAT=JSON

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This commits adds the "materialization" block to the output of
EXPLAIN/ANALYZE FORMAT=JSON when materialized subqueries are involved
into processing. In the case of ANALYZE additional runtime information
is displayed, such as:
  - chosen strategy of materialization
  - number of partial match/index lookup loops
  - sizes of partial match buffers
This commit is contained in:
Oleg Smirnov
2024-05-04 19:50:55 +07:00
parent a5e4c34991
commit aae3233c4f
14 changed files with 2024 additions and 615 deletions
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5
sql/sql_select.cc
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@ -1729,6 +1729,11 @@ bool JOIN::build_explain()
curr_tab->tracker= tmp->get_using_temporary_read_tracker();
}
}
if (is_in_subquery())
{
Item_in_subselect *subq= unit->item->get_IN_subquery();
subq->init_subq_materialization_tracker(thd);
}
DBUG_RETURN(0);
}