alamb commented on code in PR #8109:
URL: https://github.com/apache/arrow-datafusion/pull/8109#discussion_r1388274473
##########
datafusion/common/src/tree_node.rs:
##########
@@ -149,6 +149,19 @@ pub trait TreeNode: Sized {
Ok(new_node)
}
+ /// Convenience utils for writing optimizers rule: recursively apply the
given 'op' first to all of its
+ /// children and then itself(Postorder Traversal) using a mutable
function, `F`.
+ /// When the `op` does not apply to a given node, it is left unchanged.
+ fn transform_up_mut<F>(self, op: &mut F) -> Result<Self>
Review Comment:
`mut` variant is needed to support changing a variable in the closure
(updating `state`)
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
