Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/10960#discussion_r51534225
--- 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 --
This is helpful to debug generated expression, especially for these
complicated functions.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
