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MDEV-30806: ANALYZE FORMAT=JSON: better support for BNL and BNL-H joins

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In block-nl-join, add:

- r_loops - this shows how many incoming record combinations this
  query plan node had.

- r_effective_rows - this shows the average number of matching rows
  that this table had for each incoming record combination. This is
  comparable with r_rows in non-blocked access methods.
  For BNL-joins, it is always equal to
   $.table.r_rows * $.table.r_filtered
  For BNL-H joins the value cannot be computed from other values

Reviewed by: Monty <monty@mariadb.org>
This commit is contained in:
Sergei Petrunia
2023-03-07 19:49:57 +03:00
parent 169def14f6
commit dc1d6213f9
14 changed files with 279 additions and 30 deletions
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4
sql/sql_explain.h
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@@ -842,8 +842,12 @@ public:
Exec_time_tracker op_tracker;
Gap_time_tracker extra_time_tracker;
/* When using join buffer: Track the reads from join buffer */
Table_access_tracker jbuf_tracker;
/* When using join buffer: Track the number of incoming record combinations */
Counter_tracker jbuf_loops_tracker;
Explain_rowid_filter *rowid_filter;
int print_explain(select_result_sink *output, uint8 explain_flags,