Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/18364#discussion_r123638453
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/TimeWindow.scala
---
@@ -152,17 +152,21 @@ object TimeWindow {
}
/**
- * Expression used internally to convert the TimestampType to Long without
losing
+ * Expression used internally to convert the TimestampType to Long and
back without losing
* precision, i.e. in microseconds. Used in time windowing.
*/
-case class PreciseTimestamp(child: Expression) extends UnaryExpression
with ExpectsInputTypes {
- override def inputTypes: Seq[AbstractDataType] = Seq(TimestampType)
- override def dataType: DataType = LongType
+case class PreciseTimestampConversion(
+ child: Expression,
+ fromType: DataType,
--- End diff --
Maybe we shouldn't be using it then? This is a purely internal expression?
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