[jira] [Commented] (BEAM-3171) convert a join into lookup

["Tyler Akidau (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-3171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16248272#comment-16248272 ] 

Tyler Akidau commented on BEAM-3171:
------------------------------------

BeamSeekableTable is a new addition as part of this improvement?

> convert a join into lookup
> --------------------------
>
>                 Key: BEAM-3171
>                 URL: https://issues.apache.org/jira/browse/BEAM-3171
>             Project: Beam
>          Issue Type: New Feature
>          Components: dsl-sql
>            Reporter: Xu Mingmin
>            Assignee: Xu Mingmin
>              Labels: experimental
>
> We use BeamSQL to run streaming jobs mostly, and  add a join_as_lookup improvement(internal branch) to cover the streaming-to-batch case(similar as [1]). I could submit a PR as experimental if people are interested. 
> The rough solution is, if one source of join node implements {{BeamSeekableTable}} and the other is not, then the join node is converted to a fact-lookup operation.
> Ref:
> [1] https://docs.google.com/document/d/1B-XnUwXh64lbswRieckU0BxtygSV58hysqZbpZmk03A/edit?usp=sharing 
> [~xumingming] [~takidau] for any comments



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