Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3673#discussion_r113665968
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/api/scala/batch/sql/JoinITCase.scala
---
@@ -369,10 +363,258 @@ class JoinITCase(
val table =
CollectionDataSets.getSmall3TupleDataSet(env).toTable(tEnv).as('a1, 'a2, 'a3)
tEnv.registerTable("A", table)
- val sqlQuery1 = "SELECT * FROM A CROSS JOIN (SELECT count(*) FROM A
HAVING count(*) < 0)"
- val result = tEnv.sql(sqlQuery1).count()
+ val sqlQuery1 = "SELECT * FROM A CROSS JOIN " +
+ "(SELECT count(*) FROM A HAVING count(*) < 0)"
+ val result = tEnv.sql(sqlQuery1)
+ val expected =Seq(
+ "2,2,Hello,null",
+ "1,1,Hi,null",
+ "3,2,Hello world,null").mkString("\n")
+
+ val results = result.toDataSet[Row].collect()
+ TestBaseUtils.compareResultAsText(results.asJava, expected)
+ }
+
+ @Test
+ def testLeftNullLeftJoin (): Unit = {
+ val env = ExecutionEnvironment.getExecutionEnvironment
+ val tEnv = TableEnvironment.getTableEnvironment(env, config)
+
+ val sqlQuery =
+ "SELECT a, cnt " +
+ "FROM" +
+ " (SELECT cnt FROM (SELECT COUNT(*) AS cnt FROM B) WHERE cnt < 0)
" +
+ "LEFT JOIN A " +
+ "ON cnt = a"
+
+ val ds1 =
CollectionDataSets.get5TupleDataSet(env).toTable(tEnv).as('a, 'b, 'c, 'd, 'e)
+ val ds2 = CollectionDataSets.getSmall3TupleDataSet(env).toTable(tEnv)
+ tEnv.registerTable("A", ds1)
+ tEnv.registerTable("B", ds2)
+
+ val result = tEnv.sql(sqlQuery).collect()
+ val resultSize = result.size
+
+ Assert.assertEquals(
+ s"Expected empty result, but actual size result =
$resultSize;\n[${result.mkString(",")}]",
+ resultSize,0)
+ }
+
+ @Test
+ def testLeftNullRightJoin(): Unit = {
+ val env = ExecutionEnvironment.getExecutionEnvironment
+ val tEnv = TableEnvironment.getTableEnvironment(env, config)
+ val sqlQuery =
+ "SELECT a, cnt " +
+ "FROM" +
+ " (SELECT cnt FROM (SELECT COUNT(*) AS cnt FROM B) WHERE cnt < 0)
" +
+ "RIGHT JOIN A " +
+ "ON a = cnt"
+
+ val ds1 =
CollectionDataSets.get5TupleDataSet(env).toTable(tEnv).as('a, 'b, 'c, 'd, 'e)
+ val ds2 = CollectionDataSets.getSmall3TupleDataSet(env).toTable(tEnv)
+ tEnv.registerTable("A", ds1)
+ tEnv.registerTable("B", ds2)
+
+
+ val result = tEnv.sql(sqlQuery)
+ val expected = Seq(
+ "1,null",
+ "2,null", "2,null",
+ "3,null", "3,null", "3,null",
+ "4,null", "4,null", "4,null", "4,null",
+ "5,null", "5,null", "5,null", "5,null", "5,null").mkString("\n")
+
+ val results = result.toDataSet[Row].collect()
+
+ TestBaseUtils.compareResultAsText(results.asJava, expected)
+ }
+
+ @Test
+ def testLeftSingleLeftJoin(): Unit = {
+ val env = ExecutionEnvironment.getExecutionEnvironment
+ val tEnv = TableEnvironment.getTableEnvironment(env, config)
+ val sqlQuery =
+ "SELECT a, cnt " +
+ "FROM" +
+ " (SELECT COUNT(*) AS cnt FROM A) " +
+ "LEFT JOIN B " +
+ "ON cnt = a"
+
+ val ds1 =
CollectionDataSets.get5TupleDataSet(env).toTable(tEnv).as('a, 'b, 'c, 'd, 'e)
+ val ds2 =
CollectionDataSets.getSmall3TupleDataSet(env).toTable(tEnv)as('a, 'b, 'c)
+ tEnv.registerTable("A", ds2)
+ tEnv.registerTable("B", ds1)
+
+ val result = tEnv.sql(sqlQuery)
+ val expected = Seq(
--- End diff --
The result should be `Seq("3,3", "3,3", "3,3")`.
The outer side may only produce a *single* row with `null` if no other row
matched.
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