add __str__ for CommandId

Signed-off-by: varun-edachali-dbx <varun.edachali@databricks.com>

Author: varun-edachali-dbx

src/databricks/sql/backend/types.py

@@ -235,6 +235,28 @@ def __init__(
         self.has_result_set = has_result_set
         self.modified_row_count = modified_row_count
 
+    def __str__(self) -> str:
+        """
+        Return a string representation of the CommandId.
+
+        For SEA backend, returns the guid.
+        For Thrift backend, returns a format like "guid|secret".
+
+        Returns:
+            A string representation of the command ID
+        """
+
+        if self.backend_type == BackendType.SEA:
+            return str(self.guid)
+        elif self.backend_type == BackendType.THRIFT:
+            secret_hex = (
+                guid_to_hex_id(self.secret)
+                if isinstance(self.secret, bytes)
+                else str(self.secret)
+            )
+            return f"{self.to_hex_guid()}|{secret_hex}"
+        return str(self.guid)
+
     @classmethod
     def from_thrift_handle(cls, operation_handle):
         """