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MDEV-20854: ANALYZE for statements: not clear where the time is spent

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Count the "gap" time between table accesses and display it as
r_other_time_ms in the "table" element.

* The advantage of this approach is that it doesn't add any new
  my_timer_cycles() calls.
* The disadvantage is that the definition of what is done during
  "other time" is not that clear: it includes checking the WHERE
  (for this table), constructing index lookup tuple (for the next table)
  writing to GROUP BY temporary table (as we dont account for that time
  separately [yet], etc)
This commit is contained in:
Sergei Petrunia 2019-11-09 21:03:23 +03:00
commit 68ed3a81f2
27 changed files with 448 additions and 206 deletions
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3
mysql-test/main/explain_json_format_partitions.result
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@ -36,7 +36,8 @@ ANALYZE
"r_loops": 1,
"rows": 10,
"r_rows": 10,
"r_total_time_ms": "REPLACED",
"r_table_time_ms": "REPLACED",
"r_other_time_ms": "REPLACED",
"filtered": 100,
"r_filtered": 30,
"attached_condition": "t1.a in (2,3,4)"