Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16674#discussion_r100594045
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/SQLViewSuite.scala ---
@@ -334,6 +389,25 @@ class SQLViewSuite extends QueryTest with SQLTestUtils
with TestHiveSingleton {
}
}
+ test("correctly handle ALTER VIEW on a referenced view") {
+ withTable("jt2") {
+ val df = (1 until 10).map(i => (i, i + 1)).toDF("i", "j")
+ df.write.format("json").saveAsTable("jt2")
+
+ withView("view1", "view2") {
+ sql("CREATE VIEW view1(x, y) AS SELECT * FROM jt")
+
+ // Create a nested view.
+ sql("CREATE VIEW view2(id, id1) AS SELECT * FROM view1")
+ checkAnswer(sql("SELECT * FROM view2 ORDER BY id"), (1 to 9).map(i
=> Row(i, i)))
+
+ // Alter the referenced view.
+ sql("ALTER VIEW view1 AS SELECT i AS x, j AS y FROM jt2")
--- End diff --
nit: `ALTER VIEW view1 AS SELECT id AS x, id1 + 1 As y FROM jt`, then we
don't need to create `jt2`
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