maropu edited a comment on issue #26918: [SPARK-30279][SQL] Support 32 or more grouping attributes for GROUPING_ID URL: https://github.com/apache/spark/pull/26918#issuecomment-566880237 > Should we just use string type for grouping id? A consistent type of grouping id sounds more reliable Yea, I think so. But, I have no idea now about the way to keep the type consistent while supporting it. > Do other systems (Hive, Presto...) have similar issue? ok, I will check later. (plz let me know if someone already knows it)
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