init writer framework

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 +1,41 @@
+// 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.
+
+//! Iceberg File Writer
+
+use super::CurrentFileStatus;
+use crate::{spec::DataFileBuilder, Result};
+use arrow_array::RecordBatch;
+use arrow_schema::SchemaRef;
+
+/// File writer builder trait.
+#[async_trait::async_trait]
+pub trait FileWriterBuilder: Send + Clone + 'static {
+    /// The associated file writer type.
+    type R: FileWriter;
+    /// Build file writer.
+    async fn build(self, schema: &SchemaRef) -> Result<Self::R>;
+}
+
+/// File writer focus on writing record batch to different physical file format.(Such as parquet. orc)
+#[async_trait::async_trait]
+pub trait FileWriter: Send + 'static + CurrentFileStatus {
+    /// Write record batch to file.
+    async fn write(&mut self, batch: &RecordBatch) -> Result<()>;
+    /// Close file writer.
+    async fn close(self) -> Result<Vec<DataFileBuilder>>;
+}

crates/iceberg/src/writer/mod.rs

@@ -0,0 +1,109 @@
+// 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.
+
+//! Iceberg writer module.
+//!
+//! The writer API is designed to be extensible and flexible. Each writer is decoupled and can be create and config independently. User can:
+//! 1.Combine different writer builder to build a writer which have complex write logic. Such as FanoutPartition + DataFileWrite or FanoutPartition + PosititionDeleteFileWrite.
+//! 2.Customize the writer and combine it with original writer builder to build a writer which
+//! can process the data in a specific way.  
+//!
+//! There are two kinds of writer and related builder:
+//! 1. `IcebergWriter` and `IcebergWriterBuilder`, they are focus on the data process logical.
+//!     If you want to support a new data process logical, you need to implement a new `IcebergWriter` and `IcebergWriterBuilder`.
+//! 2. `FileWriter` and `FileWriterBuilder`, they are focus on the physical file write.
+//!     If you want to support a new physical file format, you need to implement a new `FileWriter` and `FileWriterBuilder`.
+//!
+//! The create process of iceberg writer is:
+//! 1. Create a `FileWriterBuilder`.
+//!     1a. Combine it with other `FileWriterBuilder` to get a new `FileWriterBuilder`.
+//! 2. Use FileWriterBuilder to create a `IcebergWriterBuilder`.
+//!     2a. Combine it with other `IcebergWriterBuilder` to get a new `IcebergWriterBuilder`.
+//! 3. Use `build` function in `IcebergWriterBuilder` to create a `IcebergWriter`.
+//!
+//! # Simple Case 1: Create a data file writer using parquet file format.
+//! # TODO(Implement this example)
+//! ```ignore
+//! // 1. Create a parquet file writer builder.
+//! let parquet_writer_builder = ParquetFileWriterBuilder::new(parquet_file_writer_config);
+//! // 2. Create a data file writer builder.
+//! let DataFileWriterBuilder = DataFileWriterBuilder::new(parquet_writer_builder,data_file_writer_config);
+//! // 3. Create a iceberg writer.
+//! let iceberg_writer = DataFileWriterBuilder.build(schema).await?;
+//!
+//! iceberg_writer.write(input).await?;
+//!
+//! let write_result = iceberg_writer.flush().await?;
+//!
+//! let data_file = write_result.into_iter().map(|builder|builder.build()).collect::<Vec<_>>();
+//! ```
+//!
+//! # Complex Case 2: Create a fanout partition data file writer using parquet file format.
+//! # TODO (Implement this example)
+//! ```ignore
+//! // 1. Create a parquet file writer builder.
+//! let parquet_writer_builder = ParquetFileWriterBuilder::new(parquet_file_writer_config);
+//! // 2. Create a data file writer builder.
+//! let DataFileWriterBuilder = DataFileWriterBuilder::new(parquet_writer_builder,data_file_writer_config);
+//! // 3. Create a fanout partition writer builder.
+//! let fanout_partition_writer_builder = FanoutPartitionWriterBuilder::new(DataFileWriterBuilder, partition_config);
+//! // 4. Create a iceberg writer.
+//! let iceberg_writer = fanout_partition_writer_builder.build(schema).await?;
+//!
+//! iceberg_writer.write(input).await?;
+//!
+//! let write_result = iceberg_writer.flush().await?;
+//!
+//! let data_file = write_result.into_iter().map(|builder|builder.build()).collect::<Vec<_>>();
+//! ```
+
+use crate::{spec::DataFileBuilder, Result};
+use arrow_array::RecordBatch;
+use arrow_schema::SchemaRef;
+
+pub mod file_writer;
+
+type DefaultInput = RecordBatch;
+
+/// The builder for iceberg writer.
+#[async_trait::async_trait]
+pub trait IcebergWriterBuilder<I = DefaultInput>: Send + Clone + 'static {
+    /// The associated writer type.
+    type R: IcebergWriter<I>;
+    /// Build the iceberg writer.
+    async fn build(self, schema: &SchemaRef) -> Result<Self::R>;
+}
+
+/// The iceberg writer used to write data to iceberg table.
+#[async_trait::async_trait]
+pub trait IcebergWriter<I = DefaultInput>: Send + 'static {
+    /// Write data to iceberg table.
+    async fn write(&mut self, input: I) -> Result<()>;
+    /// Flush the writer and return the write result.
+    async fn flush(&mut self) -> Result<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;
+}