Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3033#discussion_r96420458
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/api/scala/batch/sql/DataSetSingleRowJoinTest.scala
---
@@ -192,4 +192,145 @@ class SingleRowJoinTest extends TableTestBase {
util.verifySql(query, expected)
}
+
+ @Test
+ def testSingleRowJoinLeftOuterJoin(): Unit = {
+ val util = batchTestUtil()
+ util.addTable[(Int, Int)]("A", 'a1, 'a2)
+ util.addTable[(Int, Int)]("B", 'b1, 'b2)
+
+ val queryLeftJoin =
+ "SELECT a2 FROM A " +
+ "LEFT JOIN " +
+ "(SELECT COUNT(*) AS cnt FROM B) " +
+ "AS x " +
+ "ON a1 < cnt"
+
+ val expected =
+ unaryNode(
+ "DataSetCalc",
+ unaryNode(
+ "DataSetSingleRowJoin",
+ batchTableNode(0),
+ term("where", "<(a1, cnt)"),
+ term("join", "a1", "a2", "cnt"),
+ term("joinType", "NestedLoopJoin")
+ ),
+ term("select", "a2")
+ ) + "\n" +
+ unaryNode(
+ "DataSetAggregate",
+ unaryNode(
+ "DataSetUnion",
+ unaryNode(
+ "DataSetValues",
+ unaryNode(
+ "DataSetCalc",
+ batchTableNode(1),
+ term("select", "0 AS $f0")),
+ tuples(List(null)), term("values", "$f0")
+ ),
+ term("union", "$f0")
+ ),
+ term("select", "COUNT(*) AS cnt")
+ )
+
+ util.verifySql(queryLeftJoin, expected)
+ }
+
+ @Test
+ def testSingleRowJoinRightOuterJoin(): Unit = {
+ val util = batchTestUtil()
+ util.addTable[(Int, Int)]("A", 'a1, 'a2)
+ util.addTable[(Int, Int)]("B", 'b1, 'b2)
+
+ val queryRightJoin =
+ "SELECT a2 FROM A " +
+ "RIGHT JOIN " +
+ "(SELECT COUNT(*) AS cnt FROM B) " +
+ "AS x " +
+ "ON a1 < cnt"
+
+ val expected =
+ unaryNode(
+ "DataSetCalc",
+ unaryNode(
+ "DataSetSingleRowJoin",
+ batchTableNode(0),
+ term("where", "<(a1, cnt)"),
+ term("join", "a1", "a2", "cnt"),
+ term("joinType", "NestedLoopJoin")
+ ),
+ term("select", "a2")
+ ) + "\n" +
+ unaryNode(
+ "DataSetAggregate",
+ unaryNode(
+ "DataSetUnion",
+ unaryNode(
+ "DataSetValues",
+ unaryNode(
+ "DataSetCalc",
+ batchTableNode(1),
+ term("select", "0 AS $f0")),
+ tuples(List(null)), term("values", "$f0")
+ ),
+ term("union", "$f0")
+ ),
+ term("select", "COUNT(*) AS cnt")
+ )
+
+ util.verifySql(queryRightJoin, expected)
+ }
+
+ @Test
+ def testSingleRowJoinInnerJoin(): Unit = {
+ val util = batchTestUtil()
+ util.addTable[(Int, Int)]("A", 'a1, 'a2)
+ val query =
+ "SELECT a2, sum(a1) " +
+ "FROM A GROUP BY a2 " +
--- End diff --
Please add a break line after `A` to make the query easier to parse.
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