Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/10410#discussion_r48132865
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CastSuite.scala
---
@@ -790,4 +820,25 @@ class CastSuite extends SparkFunSuite with
ExpressionEvalHelper {
checkEvaluation(cast("abc", BooleanType), null)
checkEvaluation(cast("", BooleanType), null)
}
+
+ test("cast between UserDefinedTypes") {
+ assert(Cast.canCast(new ExampleUDT, new ExampleUDT) == true)
+ assert(Cast.canCast(new ExampleUDT, new Example2UDT) == false)
+
+ val udt = new ExampleClass
+
+ val castExpression = Cast(Literal.create(udt, new ExampleUDT), new
ExampleUDT)
+ checkEvaluationWithoutCodegen(castExpression, udt)
+ val castExpression2 = Cast(Literal.create(0.0, new ExampleUDT), new
ExampleUDT)
+ checkEvaluationWithGeneratedMutableProjection(castExpression2, 0.0)
--- End diff --
For codgen case, the internal data for ExampleUDT here is double.
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