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MDEV-30812: Improve output cardinality estimates for hash join

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Introduce @@optimizer_switch flag: hash_join_cardinality

When it is on, use EITS statistics to produce tighter bounds for
hash join output cardinality.

Amended by Monty.

Reviewed by: Monty <monty@mariadb.org>
This commit is contained in:
Sergei Petrunia
2023-03-09 17:04:07 +03:00
parent 2eb7bf1ec3
commit 4329ec5d3b
10 changed files with 363 additions and 53 deletions
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mysql-test/main/mysqld--help.result
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@@ -734,7 +734,8 @@ The following specify which files/extra groups are read (specified before remain
extended_keys, exists_to_in, orderby_uses_equalities,
condition_pushdown_for_derived, split_materialized,
condition_pushdown_for_subquery, rowid_filter,
condition_pushdown_from_having, not_null_range_scan
condition_pushdown_from_having, not_null_range_scan,
hash_join_cardinality
--optimizer-trace=name
Controls tracing of the Optimizer:
optimizer_trace=option=val[,option=val...], where option