eliaperantoni commented on code in PR #14439:
URL: https://github.com/apache/datafusion/pull/14439#discussion_r1943780039


##########
datafusion/common/src/error.rs:
##########
@@ -425,29 +442,38 @@ impl DataFusionError {
         "".to_owned()
     }
 
-    fn error_prefix(&self) -> &'static str {
+    fn error_prefix(&self) -> Cow<str> {
         match self {
-            DataFusionError::ArrowError(_, _) => "Arrow error: ",
+            DataFusionError::ArrowError(_, _) => Cow::Borrowed("Arrow error: 
"),
             #[cfg(feature = "parquet")]
-            DataFusionError::ParquetError(_) => "Parquet error: ",
+            DataFusionError::ParquetError(_) => Cow::Borrowed("Parquet error: 
"),
             #[cfg(feature = "avro")]
-            DataFusionError::AvroError(_) => "Avro error: ",
+            DataFusionError::AvroError(_) => Cow::Borrowed("Avro error: "),
             #[cfg(feature = "object_store")]
-            DataFusionError::ObjectStore(_) => "Object Store error: ",
-            DataFusionError::IoError(_) => "IO error: ",
-            DataFusionError::SQL(_, _) => "SQL error: ",
-            DataFusionError::NotImplemented(_) => "This feature is not 
implemented: ",
-            DataFusionError::Internal(_) => "Internal error: ",
-            DataFusionError::Plan(_) => "Error during planning: ",
-            DataFusionError::Configuration(_) => "Invalid or Unsupported 
Configuration: ",
-            DataFusionError::SchemaError(_, _) => "Schema error: ",
-            DataFusionError::Execution(_) => "Execution error: ",
-            DataFusionError::ExecutionJoin(_) => "ExecutionJoin error: ",
-            DataFusionError::ResourcesExhausted(_) => "Resources exhausted: ",
-            DataFusionError::External(_) => "External error: ",
-            DataFusionError::Context(_, _) => "",
-            DataFusionError::Substrait(_) => "Substrait error: ",
-            DataFusionError::Diagnostic(_, _) => "",
+            DataFusionError::ObjectStore(_) => Cow::Borrowed("Object Store 
error: "),
+            DataFusionError::IoError(_) => Cow::Borrowed("IO error: "),
+            DataFusionError::SQL(_, _) => Cow::Borrowed("SQL error: "),
+            DataFusionError::NotImplemented(_) => {
+                Cow::Borrowed("This feature is not implemented: ")
+            }
+            DataFusionError::Internal(_) => Cow::Borrowed("Internal error: "),
+            DataFusionError::Plan(_) => Cow::Borrowed("Error during planning: 
"),
+            DataFusionError::Configuration(_) => {
+                Cow::Borrowed("Invalid or Unsupported Configuration: ")
+            }
+            DataFusionError::SchemaError(_, _) => Cow::Borrowed("Schema error: 
"),
+            DataFusionError::Execution(_) => Cow::Borrowed("Execution error: 
"),
+            DataFusionError::ExecutionJoin(_) => Cow::Borrowed("ExecutionJoin 
error: "),
+            DataFusionError::ResourcesExhausted(_) => {
+                Cow::Borrowed("Resources exhausted: ")
+            }
+            DataFusionError::External(_) => Cow::Borrowed("External error: "),
+            DataFusionError::Context(_, _) => Cow::Borrowed(""),
+            DataFusionError::Substrait(_) => Cow::Borrowed("Substrait error: 
"),
+            DataFusionError::Diagnostic(_, _) => Cow::Borrowed(""),
+            DataFusionError::Collection(errs) => {
+                Cow::Owned(format!("{} errors, first error: {}", errs.len(), 
errs.first().expect("cannot construct DataFusionError::Collection with 0 
errors, but got one such case").error_prefix()))

Review Comment:
   Yeah good point, probably not a lot of value to see the number of errors. 
I'll change it



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