adriangb commented on code in PR #16589:
URL: https://github.com/apache/datafusion/pull/16589#discussion_r2265353201
##########
datafusion/physical-expr-adapter/src/schema_rewriter.rs:
##########
@@ -220,13 +223,111 @@ impl<'a> DefaultPhysicalExprAdapterRewriter<'a> {
&self,
expr: Arc<dyn PhysicalExpr>,
) -> Result<Transformed<Arc<dyn PhysicalExpr>>> {
+ if let Some(transformed) =
self.try_rewrite_struct_field_access(&expr)? {
+ return Ok(Transformed::yes(transformed));
+ }
+
if let Some(column) = expr.as_any().downcast_ref::<Column>() {
return self.rewrite_column(Arc::clone(&expr), column);
}
Ok(Transformed::no(expr))
}
+ fn try_rewrite_struct_field_access(
+ &self,
+ expr: &Arc<dyn PhysicalExpr>,
+ ) -> Result<Option<Arc<dyn PhysicalExpr>>> {
+ let get_field_expr = match
expr.as_any().downcast_ref::<ScalarFunctionExpr>() {
+ Some(expr) => expr,
+ None => return Ok(None),
+ };
+
+ if get_field_expr.name() != "get_field" {
Review Comment:
I've seen / used this pattern a lot. I added 50b1e91 which should simplify
it not just for this PR but any other use of matching a specific function from
a PhysicalExpr as well.
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