[GitHub] cloud-fan commented on a change in pull request #23606: [SPARK-26666][SQL] Support DSv2 overwrite and dynamic partition overwrite.

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cloud-fan commented on a change in pull request #23606: [SPARK-26666][SQL] Support DSv2 overwrite and dynamic partition overwrite.
URL: https://github.com/apache/spark/pull/23606#discussion_r252912696
 
 

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 File path: sql/core/src/main/scala/org/apache/spark/sql/sources/filters.scala
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 @@ -218,3 +218,23 @@ case class StringEndsWith(attribute: String, value: String) extends Filter {
 case class StringContains(attribute: String, value: String) extends Filter {
   override def references: Array[String] = Array(attribute)
 }
+
+/**
+ * A filter that always evaluates to `true`.
+ */
+case class AlwaysTrue() extends Filter {
 
 Review comment:
   why it's a case class instead of object?

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