fixup

Author: zhztheplayer

docs/Configuration.md

@@ -25,6 +25,7 @@ nav_order: 15
 | spark.gluten.enabled                                               | true              | Whether to enable gluten. Default value is true. Just an experimental property. Recommend to enable/disable Gluten through the setting for spark.plugins.                                                                                                                                                                                                                      |
 | spark.gluten.execution.resource.expired.time                       | 86400             | Expired time of execution with resource relation has cached.                                                                                                                                                                                                                                                                                                                   |
 | spark.gluten.expression.blacklist                                  | <undefined> | A black list of expression to skip transform, multiple values separated by commas.                                                                                                                                                                                                                                                                                             |
+| spark.gluten.costModel                                             | legacy            | The class name of user-defined cost model that will be used by Gluten's transition planner. If not specified, a legacy built-in cost model will be used. The legacy cost model helps RAS planner exhaustively offload computations, and helps transition planner choose columnar-to-columnar transition over others.                                                           |
 | spark.gluten.loadLibFromJar                                        | false             | Whether to load shared libraries from jars.                                                                                                                                                                                                                                                                                                                                    |
 | spark.gluten.loadLibOS                                             | <undefined> | The shared library loader's OS name.                                                                                                                                                                                                                                                                                                                                           |
 | spark.gluten.loadLibOSVersion                                      | <undefined> | The shared library loader's OS version.                                                                                                                                                                                                                                                                                                                                        |