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MDEV-32351: Significant slowdown with outer joins: Test coverage

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Make ANALYZE FORMAT=JSON print block-nl-join.r_unpack_ops when
analyze_print_r_unpack_ops debug flag is set.

Then, add a testcase.
This commit is contained in:
Sergei Petrunia
2023-10-26 20:44:10 +03:00
committed by Oleksandr Byelkin
parent 4ed5900626
commit 9bf2e5e3fe
3 changed files with 150 additions and 0 deletions
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5
sql/sql_explain.cc
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@ -1907,6 +1907,11 @@ 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());
DBUG_EXECUTE_IF("analyze_print_r_unpack_ops",
{
writer->add_member("r_unpack_ops");
writer->add_ull(jbuf_unpack_tracker.get_loops());
});
}
}