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This request allows a support function to replace a function call appearing in FROM (typically a set-returning function) with an equivalent SELECT subquery. The subquery will then be subject to the planner's usual optimizations, potentially allowing a much better plan to be generated. While the planner has long done this automatically for simple SQL-language functions, it's now possible for extensions to do it for functions outside that group. Notably, this could be useful for functions that are presently implemented in PL/pgSQL and work by generating and then EXECUTE'ing a SQL query. Author: Paul A Jungwirth <pj@illuminatedcomputing.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/09de6afa-c33d-4d94-a5cb-afc6cea0d2bb@illuminatedcomputing.com