In [1] we've reached a conclusion that for a MATERIALIZED CTE it's okay to 'allow our statistics or guesses for the sub-query to subsequently influence what the upper planner does'. Commit f7816aec23 exposes column statistics to the upper planner. In the light of that, here is a patch that exposes info about the ordering of the CTE result to the upper planner.
This patch was initially posted in that same thread and has received some comments from Tom in [2]. Due to the presence of multiple patches in that thread, it has led to confusion. So fork a new thread here specifically dedicated to discussing the patch about exposing pathkeys from CTEs to the upper planner. Comments/thoughts? [1] https://www.postgresql.org/message-id/482957.1700192299%40sss.pgh.pa.us [2] https://www.postgresql.org/message-id/1339607.1700502358%40sss.pgh.pa.us Thanks Richard
v3-0001-Propagate-pathkeys-from-CTEs-up-to-the-outer-query.patch
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