Hi, During query tuning, users may want to check if GEQO is used or not to generate a plan. However, users can not know it by simply counting the number of tables that appear in SQL. I know we can know it by enabling GEQO_DEBUG flag, but it needs recompiling, so I think it is inconvenient.
So, I would like to propose to add a debug level message that shows when PostgreSQL use GEQO. That enables users to easily see it by just changing log_min_messages. Use cases are as follows: - When investigating about the result of planning, user can determine whether the plan is chosen by the standard planning or GEQO. - When tuning PostgreSQL, user can determine the suitable value of geqo_threshold parameter. Best regards. -- KAWAMOTO Masaya <kawam...@sraoss.co.jp> SRA OSS, Inc. Japan
debugmessage_about_geqo.patch
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