Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3673#discussion_r116250994
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/logical/FlinkLogicalJoin.scala
---
@@ -77,7 +77,9 @@ private class FlinkLogicalJoinConverter
val join: LogicalJoin = call.rel(0).asInstanceOf[LogicalJoin]
val joinInfo = join.analyzeCondition
- hasEqualityPredicates(join, joinInfo) || isSingleRowInnerJoin(join)
+ (hasEqualityPredicates(join, joinInfo)
+ || isSingleRowInnerJoin(join)
+ || isOuterJoinWithSingleRowAtOuterSide(join, joinInfo))
--- End diff --
We need here the same condition as in `DataSetSingleRowJoinRule.matches()`:
```
join.getJoinType match {
case JoinRelType.INNER if isSingleRow(join.getRight) ||
isSingleRow(join.getLeft) => true
case JoinRelType.LEFT if isSingleRow(join.getRight) => true
case JoinRelType.RIGHT if isSingleRow(join.getLeft) => true
case _ => false
}
```
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