refactor(click_types): skip serialization for default values (#2418)

Signed-off-by: Kevin Su <pingsutw@apache.org>

flytekit/clis/sdk_in_container/run.py

@@ -531,7 +531,8 @@ def _run(*args, **kwargs):
                         raise click.UsageError(
                             f"Default for '{input_name}' is a query, which must be specified when running locally."
                         )
-                inputs[input_name] = processed_click_value
+                if processed_click_value is not None:
+                    inputs[input_name] = processed_click_value
 
             if not run_level_params.is_remote:
                 with FlyteContextManager.with_context(_update_flyte_context(run_level_params)):

flytekit/interaction/click_types.py

@@ -383,6 +383,9 @@ def convert(
             if self._python_type is datetime.date:
                 # Click produces datetime, so converting to date to avoid type mismatch error
                 value = value.date()
+            # If the input matches the default value in the launch plan, serialization can be skipped.
+            if param and value == param.default:
+                return None
             lit = TypeEngine.to_literal(self._flyte_ctx, value, self._python_type, self._literal_type)
 
             if not self._is_remote: