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When search_path is changed to something that was previously set, and no invalidation happened in between, use the cached list of namespace OIDs rather than recomputing them. This avoids syscache lookups and ACL checks. Important when the search_path changes frequently, such as when set in proconfig. An earlier version of this patch was reviewd by Nathan Bossart. This version simplifies a few things and is safer in case of OOM. Discussion: https://www.postgresql.org/message-id/abf4ce8804e0e05dff8c1725ae6a8ed28b7d66e0.camel%40j-davis.com Reviewed-by: Nathan Bossart