feat: init file writer interface (#168)

* init file writer interface

* refine

---------

Co-authored-by: ZENOTME <[email protected]>

Author: ZENOTME

crates/iceberg/src/lib.rs

@@ -51,3 +51,5 @@ mod scan;
 pub mod expr;
 pub mod transaction;
 pub mod transform;
+
+pub mod writer;

crates/iceberg/src/writer/file_writer/mod.rs

@@ -0,0 +1,39 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+//! This module contains the writer for data file format supported by iceberg: parquet, orc.
+
+use super::{CurrentFileStatus, DefaultOutput};
+use crate::Result;
+use arrow_array::RecordBatch;
+use futures::Future;
+
+/// File writer builder trait.
+pub trait FileWriterBuilder<O = DefaultOutput>: Send + Clone + 'static {
+    /// The associated file writer type.
+    type R: FileWriter<O>;
+    /// Build file writer.
+    fn build(self) -> impl Future<Output = Result<Self::R>> + Send;
+}
+
+/// File writer focus on writing record batch to different physical file format.(Such as parquet. orc)
+pub trait FileWriter<O = DefaultOutput>: Send + CurrentFileStatus + 'static {
+    /// Write record batch to file.
+    fn write(&mut self, batch: &RecordBatch) -> impl Future<Output = Result<()>> + Send;
+    /// Close file writer.
+    fn close(self) -> impl Future<Output = Result<O>> + Send;
+}

crates/iceberg/src/writer/mod.rs

@@ -0,0 +1,35 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+//! The iceberg writer module.
+
+use crate::spec::DataFileBuilder;
+
+pub mod file_writer;
+
+type DefaultOutput = Vec<DataFileBuilder>;
+
+/// The current file status of iceberg writer. It implement for the writer which write a single
+/// file.
+pub trait CurrentFileStatus {
+    /// Get the current file path.
+    fn current_file_path(&self) -> String;
+    /// Get the current file row number.
+    fn current_row_num(&self) -> usize;
+    /// Get the current file written size.
+    fn current_written_size(&self) -> usize;
+}