Sergei Petrunia 37c444e1a0 EXPLAIN FORMAT=JSON: further development ...

Writing JSON:
- Fix a bug in Single_line_formatting_helper
- Add Json_writer_nesting_guard - safety class

EXPLAIN JSON support
- Add basic subquery support
- Add tests for UNION/UNION ALL.

2014-11-27 19:32:48 +03:00

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