ueshin commented on issue #25728: [SPARK-29020][SQL] Improving array_sort behaviour URL: https://github.com/apache/spark/pull/25728#issuecomment-530031779 As the original motivation, we might want to support a comparator function rather than an ascending flag to follow Presto. I think the null ordering is also following Presto, btw. How about adding the comparator function here instead? Then we can make `sort_array` as `Unvaluable` and replace it to `array_sort` with appropriate comparator in Analyzer in the following PRs. I'm not sure we should deprecate `sort_array` in that case, though. WDYT?
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