Chengxiang Li created FLINK-3504:
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Summary: [SQL] 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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