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https://issues.apache.org/jira/browse/FLINK-3504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chengxiang Li updated FLINK-3504:
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Summary: Join fails while have expression inside join condition. (was:
[SQL] Join fails while have expression inside join condition.)
> Join fails while have expression inside join condition.
> -------------------------------------------------------
>
> Key: FLINK-3504
> URL: https://issues.apache.org/jira/browse/FLINK-3504
> Project: Flink
> Issue Type: Bug
> Components: Table API
> Reporter: Chengxiang Li
>
> {noformat}
> val ds1 = CollectionDataSets.get3TupleDataSet(env).as('a, 'b, 'c)
> val ds2 = CollectionDataSets.get5TupleDataSet(env).as('d, 'e, 'f, 'g, 'h)
> val joinT = ds1.join(ds2).filter('a + 3 === 'd).select('c, 'g)
> {noformat}
> This query would throw exception:
> {noformat}
> Caused by: org.apache.flink.api.table.TableException: Joins should have at
> least one equality condition
> at
> org.apache.flink.api.table.plan.rules.dataset.DataSetJoinRule.convert(DataSetJoinRule.scala:57)
> at
> org.apache.calcite.rel.convert.ConverterRule.onMatch(ConverterRule.java:116)
> at
> org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:228)
> ... 44 more
> {noformat}
> There are 2 issues here:
> # DataSetJoinRule does not support expression inside join condition.
> # JoinPushExpressionsRulewould add a Project to calculate expression value
> before Join, so the join condition does not include expression any more,
> however, it's not returned after the logical optimization.
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