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Comment: add information for hive.fetch.task.conversion from Navis Ryu (HIVE-2925) – thanks Navis

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1. minimal:  SELECT *, FILTER on partition columns (WHERE and HAVING clauses), LIMIT only
2. more:  SELECT, FILTER, LIMIT only (including TABLESAMPLE, virtual columns)

"more" can take any kind of expressions in the SELECT clause, including UDFs.
(UDTFs and lateral views are not yet supported – see HIVE-5718.)

hive.fetch.task.aggr
  • Default Value: false
  • Added In: Hive 0.12.0 with HIVE-4002 (description added in Hive 0.13.0 with HIVE-5793)

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