cloud-fan commented on code in PR #51091:
URL: https://github.com/apache/spark/pull/51091#discussion_r2133073202
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/MergeRows.scala:
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@@ -87,7 +87,11 @@ object MergeRows {
override def dataType: DataType = NullType
}
- case class Keep(condition: Expression, output: Seq[Expression]) extends
Instruction {
+ case class Keep(
+ condition: Expression,
+ output: Seq[Expression],
+ isSystem: Boolean = false)
Review Comment:
can we add a small comment to explain what this flag means?
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