make fields private

Author: askalt

datafusion-examples/examples/udf/table_list_udtf.rs

@@ -74,7 +74,7 @@ impl TableFunctionImpl for TableListUdtf {
             );
         }
         let state = args
-            .session
+            .session()
             .as_any()
             .downcast_ref::<SessionState>()
             .ok_or_else(|| {

datafusion/catalog/src/table.rs

@@ -510,9 +510,9 @@ pub trait TableProviderFactory: Debug + Sync + Send {
 /// Describes arguments provided to the table function call.
 pub struct TableFunctionArgs<'e, 's> {
     /// Call arguments.
-    pub exprs: &'e [Expr],
+    exprs: &'e [Expr],
     /// Session within which the function is called.
-    pub session: &'s dyn Session,
+    session: &'s dyn Session,
 }
 
 impl<'e, 's> TableFunctionArgs<'e, 's> {

datafusion/ffi/src/udtf.rs

@@ -274,7 +274,7 @@ impl From<FFI_TableFunction> for Arc<dyn TableFunctionImpl> {
 impl TableFunctionImpl for ForeignTableFunction {
     fn call_with_args(&self, args: TableFunctionArgs) -> Result<Arc<dyn TableProvider>> {
         let session = FFI_SessionRef::new(
-            args.session,
+            args.session(),
             self.0.runtime(),
             self.0.logical_codec.clone(),
         );