adriangb commented on code in PR #18176:
URL: https://github.com/apache/datafusion/pull/18176#discussion_r2448519299
##########
datafusion/physical-plan/src/projection.rs:
##########
@@ -232,6 +236,163 @@ impl From<(Arc<dyn PhysicalExpr>, String)> for
ProjectionExpr {
}
}
+impl From<&(Arc<dyn PhysicalExpr>, String)> for ProjectionExpr {
+ fn from(value: &(Arc<dyn PhysicalExpr>, String)) -> Self {
+ Self::new(Arc::clone(&value.0), value.1.clone())
+ }
+}
+
+impl From<ProjectionExpr> for (Arc<dyn PhysicalExpr>, String) {
+ fn from(value: ProjectionExpr) -> Self {
+ (value.expr, value.alias)
+ }
+}
+
+/// A collection of projection expressions.
+///
+/// This struct encapsulates multiple `ProjectionExpr` instances,
+/// representing a complete projection operation and provides
+/// methods to manipulate and analyze the projection as a whole.
+#[derive(Debug, Clone)]
+pub struct Projection {
Review Comment:
I moved it into `physical-expr/projection.rs` and also moved
`ProjectionMapping` from `physical-expr/distribution/projection.rs` into this
new module
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