cloud-fan commented on a change in pull request #31034:
URL: https://github.com/apache/spark/pull/31034#discussion_r555011370
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
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@@ -38,6 +39,11 @@ import org.apache.spark.unsafe.types.UTF8String.{IntWrapper,
LongWrapper}
object Cast {
+ /**
+ * A tag to decide if a CAST is generated during analysis.
+ */
+ val AUTO_GENERATED_TAG = new TreeNodeTag[Boolean]("auto-generated-cast")
Review comment:
it's a bit weird to have a property that can only be set to false. How
about `user_specified_cast` that can only be set to true?
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