Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/22375#discussion_r217454434 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionEvalHelperSuite.scala --- @@ -35,6 +36,13 @@ class ExpressionEvalHelperSuite extends SparkFunSuite with ExpressionEvalHelper val e = intercept[RuntimeException] { checkEvaluation(BadCodegenExpression(), 10) } assert(e.getMessage.contains("some_variable")) } + + test("SPARK-25388: checkEvaluation should fail if nullable in DataType is incorrect") { + val e = intercept[RuntimeException] { + checkEvaluation(MapIncorrectDataTypeExpression(), Map(3 -> 7, 6 -> null)) --- End diff -- Here is an output. This is because the test correctly detects a failure even in codegen-off mode, too. ``` "Incorrect evaluation (codegen off): mapincorrectdatatypeexpression(), actual: keys: [3,6], values: [7,null], expected: keys: [3,6], values: [7,-1]" did not contain "Incorrect evaluation in unsafe mode" ScalaTestFailureLocation: org.apache.spark.sql.catalyst.expressions.ExpressionEvalHelperSuite$$anonfun$4 at (ExpressionEvalHelperSuite.scala:44) org.scalatest.exceptions.TestFailedException: "Incorrect evaluation (codegen off): mapincorrectdatatypeexpression(), actual: keys: [3,6], values: [7,null], expected: keys: [3,6], values: [7,-1]" did not contain "Incorrect evaluation in unsafe mode" at org.scalatest.Assertions$class.newAssertionFailedException(Assertions.scala:528) ... ```
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