9e703987a8
In the previous design, the GetForeignUpperPaths FDW callback hook was called before we got around to labeling upper relations with the proper consider_parallel flag; this meant that any upper paths created by an FDW would be marked not-parallel-safe. While that's probably just as well right now, we aren't going to want it to be true forever. Hence, abandon the idea that FDWs should be allowed to inject upper paths before the core code has gotten around to creating the relevant upper relation. (Well, actually they still can, but it's on their own heads how well it works.) Instead, adopt the same API already designed for create_upper_paths_hook: we call GetForeignUpperPaths after each upperrel has been created and populated with the paths the core planner knows how to make. |
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