Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/3141
Hi @lincoln-lil , thank your for the PR. I think the issue is only for
1.2.0, so please create a new pull request to commit into `release-1.2`. For
`master` we will directly fix the bug.
I have taken a quick look at it. I think a better approach is to disable
outer joins with non-equality in
[`DataSetJoinRule`](https://github.com/apache/flink/blob/master/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/dataSet/DataSetJoinRule.scala#L43),
not mix the code in SQL translation. such as
```scala
override def matches(call: RelOptRuleCall): Boolean = {
val join: LogicalJoin = call.rel(0).asInstanceOf[LogicalJoin]
val joinInfo = join.analyzeCondition
// joins require an equi-condition or a conjunctive predicate with at
least one equi-condition
// and outer joins with non-equality predicates is not supported
currently
!joinInfo.pairs().isEmpty && (join.getJoinType == JoinRelType.INNER ||
joinInfo.isEqui)
}
```
And also please add checks in
[`operators.scala`](https://github.com/apache/flink/blob/release-1.2/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/logical/operators.scala#L455)
to give a good exception for TableAPI outer joins.
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