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  1. Hive
  2. HIVE-15251

Provide support for complex expressions in ON clauses for OUTER joins

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 2.2.0
    • Fix Version/s: 2.2.0
    • Component/s: CBO, Parser
    • Labels:
      None

      Description

      Follow-up of HIVE-15211.

      Currently, we have some restrictions on the predicates that we can use in ON clauses for outer joins.

      This patch is an extension to overcome these restrictions. Follow-up work will focus on identifying some cases, such as disjunctive predicates, that can be run more efficiently than with a cartesian product.

      It will allow to write queries that currently fail in Hive such as:

      -- Disjunctions
      SELECT *
      FROM src1 LEFT OUTER JOIN src
      ON (src1.key=src.key
        OR src1.value between 100 and 102
        OR src.value between 100 and 102)
      LIMIT 10;
      -- Conjunction with multiple inputs references in one side
      SELECT *
      FROM src1 RIGHT OUTER JOIN src
      ON (src1.key+src.key >= 100
        AND src1.key+src.key <= 102)
      LIMIT 10;
      -- Conjunct with no references
      SELECT *
      FROM src1 FULL OUTER JOIN src
      ON (src1.value between 100 and 102
        AND src.value between 100 and 102
        AND true)
      LIMIT 10;
      

        Attachments

        1. HIVE-15251.patch
          462 kB
          Jesus Camacho Rodriguez
        2. HIVE-15251.01.patch
          519 kB
          Jesus Camacho Rodriguez

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              • Assignee:
                jcamachorodriguez Jesus Camacho Rodriguez
                Reporter:
                jcamachorodriguez Jesus Camacho Rodriguez
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                • Created:
                  Updated:
                  Resolved: