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https://issues.apache.org/jira/browse/BEAM-6114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16914535#comment-16914535
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Rahul Patwari commented on BEAM-6114:
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To support all types of Joins with Seekable Join Bounded, we have to enhance
[BeamJoinTransforms.JoinAsLookup|[https://github.com/apache/beam/blob/ad92513154fca8a7ef0a2f44b9ff54c005cbc565/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/transform/BeamJoinTransforms.java#L175].
as the current logic for
[LookupJoin|https://github.com/apache/beam/blob/ad92513154fca8a7ef0a2f44b9ff54c005cbc565/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/transform/BeamJoinTransforms.java#L236]
doesn't take care of all the join
types.|https://github.com/apache/beam/blob/ad92513154fca8a7ef0a2f44b9ff54c005cbc565/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/transform/BeamJoinTransforms.java#L175].]
We also have to introduce a method in
[BeamSqlSeekableTable|https://github.com/apache/beam/blob/862b04c100360c58fb4e867d97d9c49525286874/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/BeamSqlSeekableTable.java#L30]
to get all the rows.
And we have to
> 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: Rahul Patwari
> Priority: Major
> Time Spent: 3.5h
> Remaining Estimate: 0h
>
> 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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