wiedld commented on code in PR #14329:
URL: https://github.com/apache/datafusion/pull/14329#discussion_r1931103667
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datafusion/expr/src/logical_plan/extension.rs:
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@@ -54,6 +57,22 @@ pub trait UserDefinedLogicalNode: fmt::Debug + Send + Sync {
/// Return the output schema of this logical plan node.
fn schema(&self) -> &DFSchemaRef;
+ /// Return the list of invariants.
+ ///
+ /// Implementing this function enables the user to define the
+ /// invariants for a given logical plan extension.
+ fn invariants(&self) -> Vec<Invariant> {
+ vec![]
+ }
Review Comment:
This is the new API which can be defined on either `UserDefinedLogicalNode`
or `UserDefinedLogicalNodeCore`.
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