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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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2
sql/sql_union.cc
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@ -1166,7 +1166,7 @@ err:
}
// One step of recursive execution
bool st_select_lex_unit::exec_recursive(bool is_driving_recursive)
{
st_select_lex *lex_select_save= thd->lex->current_select;