Kenneth Knowles created BEAM-6114:
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Summary: SQL join selection should be done in planner, not in
expansion to PTransform
Key: BEAM-6114
URL: https://issues.apache.org/jira/browse/BEAM-6114
Project: Beam
Issue Type: Improvement
Components: dsl-sql
Reporter: Kenneth Knowles
Assignee: Kenneth Knowles
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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