Github user jaceklaskowski commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22154#discussion_r234177079
  
    --- Diff: 
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CodeGeneratorWithInterpretedFallbackSuite.scala
 ---
    @@ -17,17 +17,33 @@
     
     package org.apache.spark.sql.catalyst.expressions
     
    +import java.util.concurrent.ExecutionException
    +
     import org.apache.spark.SparkFunSuite
    +import org.apache.spark.sql.catalyst.expressions.codegen.{CodeAndComment, 
CodeGenerator}
     import org.apache.spark.sql.catalyst.plans.PlanTestBase
     import org.apache.spark.sql.internal.SQLConf
    -import org.apache.spark.sql.types.{IntegerType, LongType}
    +import org.apache.spark.sql.types.IntegerType
     
     class CodeGeneratorWithInterpretedFallbackSuite extends SparkFunSuite with 
PlanTestBase {
     
    -  test("UnsafeProjection with codegen factory mode") {
    -    val input = Seq(LongType, IntegerType)
    -      .zipWithIndex.map(x => BoundReference(x._2, x._1, true))
    +  object FailedCodegenProjection
    +      extends CodeGeneratorWithInterpretedFallback[Seq[Expression], 
UnsafeProjection] {
    +
    +    override protected def createCodeGeneratedObject(in: Seq[Expression]): 
UnsafeProjection = {
    +      val invalidCode = new CodeAndComment("invalid code", Map.empty)
    +      // We assume this compilation throws an exception
    --- End diff --
    
    I'd use this comment as part of an exception (say `IllegalStateException` 
or similar) that should be thrown rather than returning `null`.  I think that 
would make the comment part of the code itself and can be checked in tests (by 
catching the exception).


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