Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10960#discussion_r51535734
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -436,3 +436,21 @@ case class Murmur3Hash(children: Seq[Expression],
seed: Int) extends Expression
}
}
}
+
+/**
+ * An expression that will print the value of child to stderr (used for
debugging codegen).
+ */
+case class Echo(child: Expression) extends UnaryExpression {
--- End diff --
So this is only used if you construct the expressions manually?
I'd rename this to PrintToStderr. Echo means it is returning whatever you
are typing in, which is not what this is about.
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