Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22075#discussion_r209475881 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala --- @@ -1852,6 +1852,11 @@ class DataFrameFunctionsSuite extends QueryTest with SharedSQLContext { df.selectExpr("transform(i, x -> x)") } assert(ex2.getMessage.contains("data type mismatch: argument 1 requires array type")) + + val ex3 = intercept[AnalysisException] { + df.selectExpr("transform(a, x -> x)") --- End diff -- what's the previous behavior?
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