HyukjinKwon commented on a change in pull request #25242: [SPARK-28497][SQL]
Disallow upcasting complex data types to string type
URL: https://github.com/apache/spark/pull/25242#discussion_r307090548
##########
File path:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/encoders/EncoderResolutionSuite.scala
##########
@@ -196,6 +196,43 @@ class EncoderResolutionSuite extends PlanTest {
encoder.resolveAndBind(attrs)
}
+ test("SPARK-28497: complex type is not compatible with string encoder
schema") {
+ val encoder = ExpressionEncoder[String]
+
+ {
+ val attrs = Seq('a.struct('x.long))
+
assert(intercept[AnalysisException](encoder.resolveAndBind(attrs)).message ==
+ s"""
+ |Cannot up cast `a` from struct<x:bigint> to string.
+ |The type path of the target object is:
+ |- root class: "java.lang.String"
+ |You can either add an explicit cast to the input data or choose a
higher precision type
+ """.stripMargin.trim + " of the field in the target object")
+ }
+
+ {
+ val attrs = Seq('a.array(StringType))
+
assert(intercept[AnalysisException](encoder.resolveAndBind(attrs)).message ==
+ s"""
+ |Cannot up cast `a` from array<string> to string.
Review comment:
It doesn't necessarily compare the whole message. We can check if the
message contains some keywords.
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