actually assign the schema

pola-rs · Jan 23, 2025 · 0e6f163 · 0e6f163
1 parent aae525d
commit 0e6f163
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/crates/polars-mem-engine/src/executors/multi_file_scan.rs b/crates/polars-mem-engine/src/executors/multi_file_scan.rs
@@ -266,10 +266,10 @@ impl MultiScanExec {
 
         let mut final_per_source_schema = Cow::Borrowed(self.file_info.schema.as_ref());
         if let Some(with_columns) = file_with_columns.as_ref() {
-            final_per_source_schema
-                .to_mut()
+            final_per_source_schema = Cow::Owned(final_per_source_schema
+                .as_ref()
                 .try_project(with_columns.as_ref())
-                .unwrap();
+                .unwrap());
         }
 
         // Remove the hive columns for each file load.