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5B Generate a separate upper relation for each stage of setop planning. · postgrespro/postgres_cluster@c596fad · GitHub
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robertmhaasrobertmhaas
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Generate a separate upper relation for each stage of setop planning.
Commit 3fc6e2d made setop planning stages return paths rather than plans, but all such paths were loosely associated with a single RelOptInfo, and only the final path was added to the RelOptInfo. Even at the time, it was foreseen that this should be changed, because there is otherwise no good way for a single stage of setop planning to return multiple paths. With this patch, each stage of set operation planning now creates a separate RelOptInfo; these are distinguished by using appropriate relid sets. Note that this patch does nothing whatsoever about actually returning multiple paths for the same set operation; it just makes it possible for a future patch to do so. Along the way, adjust things so that create_upper_paths_hook is called for each of these new RelOptInfos rather than just once, since that might be useful to extensions using that hook. It might be a good to provide an FDW API here as well, but I didn't try to do that for now. Patch by me, reviewed and tested by Ashutosh Bapat and Rajkumar Raghuwanshi. Discussion: http://postgr.es/m/CA+TgmoaLRAOqHmMZx=ESM3VDEPceg+-XXZsRXQ8GtFJO_zbMSw@mail.gmail.com
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