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Postgres knows whether a given aggregate is parallel-safe, and creates parallel aggregation plans based on that. The `partialize_agg` is a wrapper we use to perform partial aggregation on data nodes. It is a pure function that produces serialized aggregation state as a result. Being pure, it doesn't influence parallel safety. This means we don't need to mark it parallel-unsafe to artificially disable the parallel plans for partial aggregation. They will be chosen as usual based on the parallel-safety of the underlying aggregate function.