feat(batch): support iceberg scan executor

src/batch/Cargo.toml

@@ -15,6 +15,8 @@ normal = ["workspace-hack"]
 
 [dependencies]
 anyhow = "1"
+arrow-array = { workspace = true }
+arrow-schema = { workspace = true }
 assert_matches = "1"
 async-recursion = "1"
 async-trait = "0.1"
@@ -24,6 +26,7 @@ futures-async-stream = { workspace = true }
 futures-util = "0.3"
 hashbrown = { workspace = true }
 hytra = "0.1.2"
+icelake = { workspace = true }
 itertools = "0.12"
 memcomparable = "0.2"
 parking_lot = { version = "0.12", features = ["arc_lock"] }

src/batch/src/error.rs

@@ -109,6 +109,13 @@ pub enum BatchError {
         DmlError,
     ),
 
+    #[error(transparent)]
+    Iceberg(
+        #[from]
+        #[backtrace]
+        icelake::Error,
+    ),
+
     // Make the ref-counted type to be a variant for easier code structuring.
     // TODO(error-handling): replace with `thiserror_ext::Arc`
     #[error(transparent)]

src/batch/src/executor/iceberg_scan.rs

@@ -0,0 +1,194 @@
+// Copyright 2024 RisingWave Labs
+//
+// Licensed 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.
+
+use std::hash::{DefaultHasher, Hash, Hasher};
+use std::sync::Arc;
+
+use anyhow::anyhow;
+use arrow_array::RecordBatch;
+use futures_async_stream::try_stream;
+use futures_util::stream::StreamExt;
+use icelake::io::{FileScan, TableScan};
+use risingwave_common::catalog::Schema;
+use risingwave_connector::sink::iceberg::IcebergConfig;
+
+use crate::error::BatchError;
+use crate::executor::{DataChunk, Executor};
+
+/// Create a iceberg scan executor.
+///
+/// # Examples
+///
+/// ```
+/// use futures_async_stream::for_await;
+/// use risingwave_batch::executor::{Executor, FileSelector, IcebergScanExecutor};
+/// use risingwave_common::catalog::{Field, Schema};
+/// use risingwave_common::types::DataType;
+/// use risingwave_connector::sink::iceberg::IcebergConfig;
+///
+/// #[tokio::test]
+/// async fn test_iceberg_scan() {
+///     let iceberg_scan_executor = IcebergScanExecutor::new(
+///         IcebergConfig {
+///             database_name: "demo_db".into(),
+///             table_name: "demo_table".into(),
+///             catalog_type: Some("storage".into()),
+///             path: "s3a://hummock001/".into(),
+///             endpoint: Some("http://127.0.0.1:9301".into()),
+///             access_key: "hummockadmin".into(),
+///             secret_key: "hummockadmin".into(),
+///             region: Some("us-east-1".into()),
+///             ..Default::default()
+///         },
+///         None,
+///         FileSelector::select_all(),
+///         1024,
+///         Schema::new(vec![
+///             Field::with_name(DataType::Int64, "seq_id"),
+///             Field::with_name(DataType::Int64, "user_id"),
+///             Field::with_name(DataType::Varchar, "user_name"),
+///         ]),
+///         "iceberg_scan".into(),
+///     );
+///
+///     let stream = Box::new(iceberg_scan_executor).execute();
+///     #[for_await]
+///     for chunk in stream {
+///         let chunk = chunk.unwrap();
+///         println!("{:?}", chunk);
+///     }
+/// }
+/// ```
+
+pub struct IcebergScanExecutor {
+    iceberg_config: IcebergConfig,
+    snapshot_id: Option<i64>,
+    file_selector: FileSelector,
+    batch_size: usize,
+
+    schema: Schema,
+    identity: String,
+}
+
+impl Executor for IcebergScanExecutor {
+    fn schema(&self) -> &risingwave_common::catalog::Schema {
+        &self.schema
+    }
+
+    fn identity(&self) -> &str {
+        &self.identity
+    }
+
+    fn execute(self: Box<Self>) -> super::BoxedDataChunkStream {
+        self.do_execute().boxed()
+    }
+}
+
+impl IcebergScanExecutor {
+    pub fn new(
+        iceberg_config: IcebergConfig,
+        snapshot_id: Option<i64>,
+        file_selector: FileSelector,
+        batch_size: usize,
+        schema: Schema,
+        identity: String,
+    ) -> Self {
+        Self {
+            iceberg_config,
+            snapshot_id,
+            file_selector,
+            batch_size,
+            schema,
+            identity,
+        }
+    }
+
+    #[try_stream(ok = DataChunk, error = BatchError)]
+    async fn do_execute(self: Box<Self>) {
+        let table = self
+            .iceberg_config
+            .load_table()
+            .await
+            .map_err(BatchError::Internal)?;
+
+        let table_scan: TableScan = table
+            .new_scan_builder()
+            .with_snapshot_id(
+                self.snapshot_id
+                    .unwrap_or_else(|| table.current_table_metadata().current_snapshot_id.unwrap()),
+            )
+            .with_batch_size(self.batch_size)
+            .with_column_names(self.schema.names())
+            .build()
+            .map_err(|e| BatchError::Internal(anyhow!(e)))?;
+        let file_scan_stream: icelake::io::FileScanStream =
+            table_scan.scan(&table).await.map_err(BatchError::Iceberg)?;
+
+        #[for_await]
+        for file_scan in file_scan_stream {
+            let file_scan: FileScan = file_scan.map_err(BatchError::Iceberg)?;
+            if !self.file_selector.select(file_scan.path()) {
+                continue;
+            }
+            let record_batch_stream = file_scan.scan().await.map_err(BatchError::Iceberg)?;
+
+            #[for_await]
+            for record_batch in record_batch_stream {
+                let record_batch: RecordBatch = record_batch.map_err(BatchError::Iceberg)?;
+                let chunk = Self::record_batch_to_chunk(record_batch)?;
+                debug_assert_eq!(chunk.data_types(), self.schema.data_types());
+                yield chunk;
+            }
+        }
+    }
+
+    fn record_batch_to_chunk(record_batch: RecordBatch) -> Result<DataChunk, BatchError> {
+        let mut columns = Vec::with_capacity(record_batch.num_columns());
+        for array in record_batch.columns() {
+            let column = Arc::new(array.try_into()?);
+            columns.push(column);
+        }
+        Ok(DataChunk::new(columns, record_batch.num_rows()))
+    }
+}
+
+pub enum FileSelector {
+    // File paths to be scanned by this executor are specified.
+    FileList(Vec<String>),
+    // Data files to be scanned by this executor could be calculated by Hash(file_path) % num_tasks == task_id.
+    // task_id, num_tasks
+    Hash(usize, usize),
+}
+
+impl FileSelector {
+    pub fn select_all() -> Self {
+        FileSelector::Hash(0, 1)
+    }
+
+    pub fn select(&self, path: &str) -> bool {
+        match self {
+            FileSelector::FileList(paths) => paths.contains(&path.to_string()),
+            FileSelector::Hash(task_id, num_tasks) => {
+                let hash = Self::hash_str_to_usize(path);
+                hash % num_tasks == *task_id
+            }
+        }
+    }
+
+    pub fn hash_str_to_usize(s: &str) -> usize {
+        let mut hasher = DefaultHasher::new();
+        s.hash(&mut hasher);
+        hasher.finish() as usize
+    }
+}

src/batch/src/executor/mod.rs

@@ -20,6 +20,7 @@ mod generic_exchange;
 mod group_top_n;
 mod hash_agg;
 mod hop_window;
+mod iceberg_scan;
 mod insert;
 mod join;
 mod limit;
@@ -52,6 +53,7 @@ pub use generic_exchange::*;
 pub use group_top_n::*;
 pub use hash_agg::*;
 pub use hop_window::*;
+pub use iceberg_scan::*;
 pub use insert::*;
 pub use join::*;
 pub use limit::*;

src/connector/src/sink/iceberg/jni_catalog.rs

@@ -29,8 +29,6 @@ use jni::JavaVM;
 use risingwave_jni_core::call_method;
 use risingwave_jni_core::jvm_runtime::{execute_with_jni_env, jobj_to_str, JVM};
 
-use crate::sink::{Result, SinkError};
-
 pub struct JniCatalog {
     java_catalog: GlobalRef,
     jvm: &'static JavaVM,
@@ -144,7 +142,7 @@ impl JniCatalog {
         name: impl ToString,
         catalog_impl: impl ToString,
         java_catalog_props: HashMap<String, String>,
-    ) -> Result<CatalogRef> {
+    ) -> anyhow::Result<CatalogRef> {
         let jvm = JVM.get_or_init()?;
 
         execute_with_jni_env(jvm, |env| {
@@ -184,6 +182,5 @@ impl JniCatalog {
                 config: base_config,
             }) as CatalogRef)
         })
-        .map_err(SinkError::Iceberg)
     }
 }