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Sergei Petrunia 6e484c3bd9 MDEV-31577: Make ANALYZE FORMAT=JSON print innodb stats

ANALYZE FORMAT=JSON output now includes table.r_engine_stats which
has the engine statistics. Only non-zero members are printed.

Internally: EXPLAIN data structures Explain_table_acccess and
Explain_update now have handler* handler_for_stats pointer.
It is used to read statistics from handler_for_stats->handler_stats.

The following applies only to 10.9+, backport doesn't use it:

Explain data structures exist after the tables are closed. We avoid
walking invalid pointers using this:
- SQL layer calls Explain_query::notify_tables_are_closed() before
  closing tables.
- After that call, printing of JSON output is disabled. Non-JSON output
  can be printed but we don't access handler_for_stats when doing that.

2023-07-21 16:50:11 +03:00

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 [slow_query_log_on]
 slow_query_log=ON
 [slow_query_log_off]
 slow_query_log=OFF