As explained in the comments for generate_orderedappend_paths, we don't currently support parameterized MergeAppend paths, and it doesn't seem like going to change anytime soon. Based on that, we could simplify create_merge_append_path a bit, such as set param_info to NULL directly rather than call get_appendrel_parampathinfo() for it. We already have an Assert on that in create_merge_append_plan.
I understand that the change would not make any difference for performance, it's just for clarity's sake. Thanks Richard
v1-0001-Simplify-create_merge_append_path-a-bit-for-clarity.patch
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