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MDEV-10372: EXPLAIN fixes for recursive CTEs, including FORMAT=JSON

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- Tabular EXPLAIN now prints "RECURSIVE UNION".
- There is a basic implementation of EXPLAIN FORMAT=JSON.
- it produces "recursive_union" JSON struct
- No other details or ANALYZE support, yet.
This commit is contained in:
Sergei Petrunia
2016-08-08 23:02:52 +03:00
parent e1c92a6ca9
commit a2f245e49f
8 changed files with 493 additions and 17 deletions
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3
sql/sql_select.cc
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@ -24186,7 +24186,8 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta,
In case this is a derived table, here we remember the number of
subselect that used to produce it.
*/
eta->derived_select_number= table->derived_select_number;
if (!(table_list && table_list->is_with_table_recursive_reference()))
eta->derived_select_number= table->derived_select_number;
/* The same for non-merged semi-joins */
eta->non_merged_sjm_number = get_non_merged_semijoin_select();