Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/12322#discussion_r59417359
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DatasetSuite.scala
---
@@ -620,6 +620,12 @@ class DatasetSuite extends QueryTest with
SharedSQLContext {
val df = streaming.join(static, Seq("b"))
assert(df.isStreaming, "streaming Dataset returned false for
'isStreaming'.")
}
+
+ test("SPARK-14554: Dataset.map may generate wrong java code for wide
table") {
+ val wideDF = sqlContext.range(10).select(Seq.tabulate(1000) {i => ('id
+ i).as(s"c$i")} : _*)
+ // Make sure the generated code for this plan can compile and execute.
+ wideDF.map(_.getLong(0)).collect()
--- End diff --
We should still use `checkAnswer` here because it provides extra debugging
info when there is an exception.
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