The function get_param_path_clause_serials() is used to get the set of pushed-down clauses enforced within a parameterized Path. Since we don't currently support parameterized MergeAppend paths, and it doesn't look like that is going to change anytime soon (as explained in the comments for generate_orderedappend_paths), we don't need to consider MergeAppendPath in this function. Is it worth removing the related code, as attached?
This change won't make any measurable difference in performance; it's just for clarity's sake. Thanks Richard
v1-0001-Remove-dead-code-in-get_param_path_clause_serials.patch
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