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  1. IMPALA
  2. IMPALA-2649 improve incremental stats scalability
  3. IMPALA-3562

Extend "compute stats" syntax to support a list of columns

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      Extend "Compute incremental stats" syntax to support a list of columns.

      This will drastically reduce the time taken to compute stats as well as memory requirement, this should fix issues like IMPALA-2649

      Very rarely do users need statistics for all columns in a table

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              vukercegovac Vuk Ercegovac
              mmokhtar Mostafa Mokhtar
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