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  1. Beam
  2. BEAM-6114

SQL join selection should be done in planner, not in expansion to PTransform

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.16.0
    • Component/s: dsl-sql
    • Labels:
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      Description

      Currently Beam SQL joins all go through a single physical operator which has a single PTransform that does all join algorithms based on properties of its input PCollections as well as the relational algebra.

      A first step is to make the needed information part of the relational algebra, so it can choose a PTransform based on that, and the PTransforms can be simpler.

      Second step is to have separate (physical) relational operators for different join algorithms.

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            • Assignee:
              rahul8383 Rahul Patwari
              Reporter:
              kenn Kenneth Knowles
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