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The partial paths that get modified may already have been used as part of a GatherPath which appears in the path list, so modifying them is not a good idea at this stage - especially because this code has no check that the PathTarget is in fact parallel-safe. When partial aggregation is being performed, this is actually harmless because we'll end up replacing the pathtargets here with the correct ones within create_grouping_paths(). But if we've got a query tree containing only scan/join operations then this can result in incorrectly pushing down parallel-restricted target list entries. If those are, for example, references to subqueries, that can crash the server; but it's wrong in any event. Amit Kapila |
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