Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21395#discussion_r189967468
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala ---
@@ -756,6 +756,10 @@ class DataFrameFunctionsSuite extends QueryTest with
SharedSQLContext {
df.selectExpr("element_at(a, -1)"),
Seq(Row("3"), Row(""), Row(null))
)
+
+ intercept[AnalysisException] {
+ Seq(("a string element", 1)).toDF().selectExpr("element_at(_1, _2)")
--- End diff --
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