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MDEV-30972: ANALYZE FORMAT=JSON: some time is unaccounted-for in BNL-H join

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After MDEV-30830 has added block-nl-join.r_unpack_time_ms, it became
apparent that there is some unaccounted-for time in BNL join operation,
namely the time that is spent after unpacking the join buffer record.

Fix this by adding a Gap_time_tracker to track the time that is spent
after unpacking the join buffer record and before any next time tracking.
The collected time is printed in block-nl-join.r_other_time_ms.

Reviewed by: Monty <monty@mariadb.org>
This commit is contained in:
Sergei Petrunia
2023-03-31 16:16:53 +03:00
parent 0269d82d53
commit 31536b2477
14 changed files with 180 additions and 9 deletions
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3
sql/sql_explain.cc
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@@ -1901,6 +1901,9 @@ void Explain_table_access::print_explain_json(Explain_query *query,
writer->add_member("r_unpack_time_ms");
writer->add_double(jbuf_unpack_tracker.get_time_ms());
writer->add_member("r_other_time_ms").
add_double(jbuf_extra_time_tracker.get_time_ms());
/*
effective_rows is average number of matches we got for an incoming
row. The row is stored in the join buffer and then is read