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Is input-pruning broken in Hive3 (over Tez/MR3) for tablesample?

Hi, TLDR; I'm unable to get input-pruning working in Hive3 for tablesample clause using buckets. In Hive2, I had bucketed tables clustered using 256 buckets. Whenever I did a SELECT ... FROM whatever WHERE ... I could see 256 mappers processing the entire table data. When I did a SELECT ... FROM