viirya commented on code in PR #52216:
URL: https://github.com/apache/spark/pull/52216#discussion_r2319334514
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeExtractors.scala:
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@@ -507,16 +490,19 @@ case class GetMapValue(child: Expression, key: Expression)
private[catalyst] def keyType = child.dataType.asInstanceOf[MapType].keyType
- override def checkInputDataTypes(): TypeCheckResult = {
- super.checkInputDataTypes() match {
- case f if f.isFailure => f
- case TypeCheckResult.TypeCheckSuccess =>
- TypeUtils.checkForOrderingExpr(keyType, prettyName)
- }
+ override def checkInputDataTypes(): TypeCheckResult = child.dataType match {
+ case _: MapType =>
+ super.checkInputDataTypes() match {
+ case f if f.isFailure => f
+ case TypeCheckResult.TypeCheckSuccess =>
+ TypeUtils.checkForOrderingExpr(keyType, prettyName)
+ }
+ // This should never happen, unless we hit a bug.
+ case other => TypeCheckResult.TypeCheckFailure(
+ "GetMapValue.child must be map type, but got " + other)
}
- // We have done type checking for child in `ExtractValue`, so only need to
check the `key`.
- override def inputTypes: Seq[AbstractDataType] = Seq(AnyDataType, keyType)
+ override def inputTypes: Seq[AbstractDataType] = Seq(MapType, keyType)
Review Comment:
Hmm, if it is possible that the child data type could be other than MapType,
the `keyType` cannot directly call `asInstanceOf` to cast to MapType, because
when we call `inputTypes`, the child data type is not done checking type.
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