feat(catalog): Add ErrorKind::CatalogCommitConflicts (#1452)

Author: CTTY

crates/catalog/rest/src/catalog.rs

@@ -768,8 +768,8 @@ impl Catalog for RestCatalog {
             }
             StatusCode::CONFLICT => {
                 return Err(Error::new(
-                    ErrorKind::Unexpected,
-                    "CommitFailedException, one or more requirements failed. The client may retry.",
+                    ErrorKind::CatalogCommitConflicts,
+                    "CatalogCommitConflicts, one or more requirements failed. The client may retry.",
                 )
                 .with_retryable(true));
             }

crates/iceberg/src/error.rs

@@ -60,6 +60,9 @@ pub enum ErrorKind {
     ///
     /// This error is returned when given iceberg feature is not supported.
     FeatureUnsupported,
+
+    /// Catalog commit failed due to outdated metadata
+    CatalogCommitConflicts,
 }
 
 impl ErrorKind {
@@ -80,6 +83,7 @@ impl From<ErrorKind> for &'static str {
             ErrorKind::NamespaceAlreadyExists => "NamespaceAlreadyExists",
             ErrorKind::NamespaceNotFound => "NamespaceNotFound",
             ErrorKind::PreconditionFailed => "PreconditionFailed",
+            ErrorKind::CatalogCommitConflicts => "CatalogCommitConflicts",
         }
     }
 }