Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/14251#discussion_r71247244
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
---
@@ -2965,4 +2965,19 @@ class SQLQuerySuite extends QueryTest with
SharedSQLContext {
}
}
}
+
+ test("SPARK-16602 Nvl/Coalesce") {
+ // NVL uses the first parameter data type.
+ checkAnswer(sql("select nvl('0', 1)"), Row("0"))
+ checkAnswer(sql("select nvl(0, '1')"), Row(0))
+ checkAnswer(sql("select nvl(null, '1')"), Row("1"))
+ checkAnswer(sql("select nvl(null, 1.1)"), Row(1.1))
+
+ // Coalesce do TypeCoercion to make them homogeneous.
+ checkAnswer(sql("select coalesce('0', 1)"), Row("0"))
+ checkAnswer(sql("select coalesce(0, '1')"), Row("0"))
+ checkAnswer(sql("select coalesce(null, '1')"), Row("1"))
+ checkAnswer(sql("select coalesce(null, 1.1)"), Row(1.1))
+ checkAnswer(sql("select coalesce(null, 1.1, '1')"), Row("1.1"))
--- End diff --
@rxin . Here, I added the comparison tests.
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