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https://issues.apache.org/jira/browse/FLINK-7865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17177438#comment-17177438
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Xingcan Cui commented on FLINK-7865:
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Hi [~godfreyhe], it took me some time to think about how to do the reversion.
However, the codebase has changed too much and I'm afraid I don't have much
bandwidth in recent days to continue working on this. I was wondering if you
could take it over. Thanks!
Some inspections that may help (hopefully):
In {{FlinkDecorrelateProgram.optimize()}},
{{RelDecorrelator.decorrelateQuery(root)}} will rewrite the
{{LogicalCorrelate}} of a left lateral join plan with extra conditions to
{{LogicalJoin}}. For left lateral join without extra conditions, it will
preserve the {{LogicalCorrelate}}.
> Remove predicate restrictions on TableFunction left outer join
> --------------------------------------------------------------
>
> Key: FLINK-7865
> URL: https://issues.apache.org/jira/browse/FLINK-7865
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / API
> Reporter: Xingcan Cui
> Assignee: Xingcan Cui
> Priority: Major
>
> To cover up the improper translation of lateral table left outer join
> (CALCITE-2004), we have temporarily forbidden the predicates (except {{true}}
> literal) in Table API (FLINK-7853) and SQL (FLINK-7854). Once the issue has
> been fixed in Calcite, we should remove the restrictions. The tasks may
> include removing Table API/SQL condition check, removing validation tests,
> enabling integration tests, updating the documents, etc.
> See [this thread on Calcite dev
> list|https://lists.apache.org/thread.html/16caeb8b1649c4da85f9915ea723c6c5b3ced0b96914cadc24ee4e15@%3Cdev.calcite.apache.org%3E]
> for more information.
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