Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/3510#discussion_r21128288
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
---
@@ -992,4 +992,17 @@ class SQLQuerySuite extends QueryTest with
BeforeAndAfterAll {
"nulldata2 on nulldata1.value <=> nulldata2.value"),
(1 to 2).map(i => Seq(i)))
}
+
+ test("Supporting Coalesce function in Spark SQL") {
+ val nullCheckData1 = TestData(1,"1") :: TestData(2,null) :: Nil
+ val rdd1 = sparkContext.parallelize((0 to 1).map(i =>
nullCheckData1(i)))
+ rdd1.registerTempTable("nulldata1")
+ val nullCheckData2 = TestData(1,"1") :: TestData(2,"2") :: Nil
+ val rdd2 = sparkContext.parallelize((0 to 1).map(i =>
nullCheckData2(i)))
+ rdd2.registerTempTable("nulldata2")
+
+ checkAnswer(sql("SELECT Coalesce(nulldata2.value,nulldata1.value) FROM
nulldata1 join " +
--- End diff --
Tests like this might be a little easier to read/write if you just use
literals in the SELECT clause.
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