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  1. Phoenix
  2. PHOENIX-1772

Add CUBE/ROLLUP/GROUPING SET operators for advanced aggregations

    Details

    • Type: New Feature
    • Status: Reopened
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Labels:

      Description

      I noticed from Phoenix language documentation ( http://phoenix.apache.org/language/index.html ) that Phoenix is missing CUBE/ROLLUP and GROUPING_SET operators which are already supported by other similar projects like Apache Pig and Apache Hive. Here is brief overview of my proposal (the syntax that is proposed below is same as PostgreSQL https://wiki.postgresql.org/wiki/Grouping_Sets)

      Proposed syntax for CUBE:
      SELECT name, place, SUM(count) FROM cars GROUP BY CUBE(name, place);

      For every row that we process we need to emit 2^n combinations of rows where n corresponds to number of aggregate columns. For the above example query, for every row we need to emit 4 rows, one for each level of aggregations

      {(name, place), (name, *), (*, place), (*, *)}

      .

      Proposed syntax for ROLLUP:
      SELECT name, place, SUM(count) FROM cars GROUP BY ROLLUP(name, place);

      For every row that we process we need to emit n+1 combinations of rows where n corresponds to number of aggregate columns. For the above example query, for every row we need to emit 3 rows, one for each hierarchical level of aggregations

      {(name, place), (name, *), (*, *)}

      .

      Propose syntax for GROUPING_SETS:
      SELECT name, place, SUM(count) FROM cars GROUP BY GROUPING SETS(name, ());

      For every row that we process we need to emit n combinations of rows where n corresponds to size of grouping set. For the above example query, for every row we need to emit 2 rows, one for each specified level of aggregations

      {(name, *), (*, *)}

        Attachments

        1. GSoCProposal.pdf
          177 kB
          Jayapriya Surendran

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            • Assignee:
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              Reporter:
              jayapriya90 Jayapriya Surendran
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              • Created:
                Updated: