Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3673#discussion_r115787219
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/api/scala/batch/sql/JoinITCase.scala
---
@@ -372,11 +366,219 @@ class JoinITCase(
val sqlQuery1 = "SELECT * FROM A CROSS JOIN (SELECT count(*) FROM A
HAVING count(*) < 0)"
val result = tEnv.sql(sqlQuery1).count()
-
Assert.assertEquals(0, result)
}
@Test
+ def testLeftNullLeftJoin (): Unit = {
--- End diff --
We need to check the following cases:
- LEFT JOIN, single row on the right
- LEFT JOIN, empty input on the right
- RIGHT JOIN, single row on the left
- RIGHT JOIN; empty input on the left
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