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https://issues.apache.org/jira/browse/CALCITE-4759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17409180#comment-17409180
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Julian Hyde commented on CALCITE-4759:
--------------------------------------
Good to know.
The proximate cause for this problem is that there is no test for either
instance of this rule in {{RelOptRulesTest}}. First step to solving this
problem would be to add a couple of tests.
> JoinPushThroughJoinRule does not match two joins
> ------------------------------------------------
>
> Key: CALCITE-4759
> URL: https://issues.apache.org/jira/browse/CALCITE-4759
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.25.0
> Reporter: Andrew Pilloud
> Priority: Major
>
> JoinPushThroughJoinRule doesn't ever get to the onMatch() condition, even
> when presented with a plan with two back to back joins. I found this as a
> test failure while upgrading Beam from Calcite 1.20 to 1.25.
> Looks like this was introduced by
> https://github.com/apache/calcite/pull/2024, I was able to workaround the
> issue by patching in the match rule prior to this change:
> https://github.com/apache/beam/pull/14729/commits/22994a0c093c91f3af58fc4a7824e8971a449907
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