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  1. Hive
  2. HIVE-20366

TPC-DS query78 stats estimates are off for is null filter

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 4.0.0
    • Component/s: Query Planning
    • Labels:
      None
    • Target Version/s:

      Description

      In Query 78, there is Left outer join between fact table combos: stores_sales LOJ store_returns, catalog_sales LOJ catalog_returns and web_sales LOJ web_returns. Each of these joins estimates only a single row and the result is BROADCAST and causes hash table memory errors

               Reducer 12                                 |
      |             Execution mode: vectorized, llap       |
      |             Reduce Operator Tree:                  |
      +----------------------------------------------------+
      |                      Explain                       |
      +----------------------------------------------------+
      |               Map Join Operator                    |
      |                 condition map:                     |
      |                      Left Outer Join 0 to 1        |
      |                 keys:                              |
      |                   0 KEY.reducesinkkey0 (type: bigint), KEY.reducesinkkey1 (type: bigint) |
      |                   1 KEY.reducesinkkey0 (type: bigint), KEY.reducesinkkey1 (type: bigint) |
      |                 outputColumnNames: _col0, _col1, _col3, _col4, _col5, _col6, _col8 |
      |                 input vertices:                    |
      |                   1 Map 14                         |
      |                 Statistics: Num rows: 10282477384 Data size: 534184867432 Basic stats: COMPLETE Column stats: COMPLETE |
      |                 Filter Operator                    |
      |                   predicate: _col8 is null (type: boolean) |
      |                  * Statistics: Num rows: 1* Data size: 52 Basic stats: COMPLETE Column stats: COMPLETE |
      

        Attachments

        1. HIVE-20366.1.patch
          7 kB
          Vineet Garg
        2. HIVE-20366.2.patch
          153 kB
          Vineet Garg
        3. HIVE-20366.3.patch
          153 kB
          Vineet Garg
        4. HIVE-20366.4.patch
          137 kB
          Vineet Garg

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              • Assignee:
                vgarg Vineet Garg
                Reporter:
                vgarg Vineet Garg
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                • Created:
                  Updated:
                  Resolved: