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https://issues.apache.org/jira/browse/BEAM-4439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16689947#comment-16689947
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Kenneth Knowles commented on BEAM-4439:
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I like the general approach of changing the rule matching. Unfortunately,
Calcite gives this error message, which is a little unclear. This error means
that there was no way to apply the existing rules to create a non-FULL join.
> Do not convert a join that we cannot support
> --------------------------------------------
>
> Key: BEAM-4439
> URL: https://issues.apache.org/jira/browse/BEAM-4439
> Project: Beam
> Issue Type: Sub-task
> Components: dsl-sql
> Reporter: Kenneth Knowles
> Priority: Major
> Labels: starter
>
> The BeamJoinRule matches all LogicalJoin operators. If we make it not match a
> full join then Calcite should look for a different plan when it converts to
> BeamLogicalConvention. That is a good step to make sure we can support things
> and also force the logical optimizer to choose non-full joins.
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