JoshRosen commented on code in PR #37460:
URL: https://github.com/apache/spark/pull/37460#discussion_r942069508
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/TryEval.scala:
##########
@@ -91,7 +91,16 @@ case class TryCast(child: Expression, toType: DataType,
timeZoneId: Option[Strin
(!Cast.needsTimeZone(child.dataType, toType) || timeZoneId.isDefined)
override lazy val replacement = {
- TryEval(Cast(child, toType, timeZoneId = timeZoneId, ansiEnabled = true))
+ if (equivalentToNonAnsiCast) {
+ Cast(child, toType, timeZoneId = timeZoneId, ansiEnabled = false)
+ } else {
+ TryEval(Cast(child, toType, timeZoneId = timeZoneId, ansiEnabled = true))
+ }
+ }
+
+ private def equivalentToNonAnsiCast: Boolean = {
+ val fromType = child.dataType
+ canUpCast(fromType, toType) || fromType == StringType
Review Comment:
Should this be
```suggestion
canUpCast(fromType, toType) || toType == StringType
```
?
We can cast anything to a string but we can't cast arbitrary strings to
arbitrary types.
##########
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/TryCastSuite.scala:
##########
@@ -39,8 +39,8 @@ class TryCastSuite extends SparkFunSuite {
}
test("nullability") {
- assert(cast("abcdef", StringType).nullable)
- assert(cast("abcdef", BinaryType).nullable)
+ assert(!cast("abcdef", StringType).nullable)
+ assert(!cast("abcdef", BinaryType).nullable)
Review Comment:
Should we also add a test case which _is_ expected to be nullable? Maybe
something like `cast("abcdef", IntegerType)`?
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