[
https://issues.apache.org/jira/browse/BEAM-6112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17085933#comment-17085933
]
Kenneth Knowles commented on BEAM-6112:
---------------------------------------
Took a look at this and now the join transforms are even stronger assumption
that they always join on leftcol = rightcol.
If we always use rewrite rules to precompute all the values needed via a
Project then this is enough. I wonder if Calcite already has a rule like that...
> SQL could support equijoins on complex expressions, not just column refs
> ------------------------------------------------------------------------
>
> Key: BEAM-6112
> URL: https://issues.apache.org/jira/browse/BEAM-6112
> Project: Beam
> Issue Type: New Feature
> Components: dsl-sql
> Reporter: Kenneth Knowles
> Priority: Major
>
> Currently a join such as {{CAST(A.x AS BIGINT) = B.y}} will fail, along with
> other similar simple expressions. We only support joining directly on
> immediate column references. It can be worked around by inserting a WITH
> clause for the intermediate value.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
