srielau commented on code in PR #40474:
URL: https://github.com/apache/spark/pull/40474#discussion_r1286212926
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala:
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@@ -429,6 +429,39 @@ case class OuterReference(e: NamedExpression)
final override val nodePatterns: Seq[TreePattern] = Seq(OUTER_REFERENCE)
}
+/**
+ * A place holder used to hold a reference that has been resolved to a field
outside of the current
+ * plan. This is used for correlated subqueries.
+ */
+case class VariableReference(varName: String, literal: Literal, canFold:
Boolean = true)
+ extends LeafExpression {
+
+ override def dataType: DataType = literal.dataType
+ override def nullable: Boolean = literal.nullable
+ override def prettyName: String = "session." + varName
+ override def foldable: Boolean = canFold
+
+ override def sql: String = varName
+
+ final override val nodePatterns: Seq[TreePattern] = Seq(RUNTIME_REPLACEABLE)
Review Comment:
Done
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