liurenjie1024 commented on code in PR #872: URL: https://github.com/apache/iceberg-rust/pull/872#discussion_r1904966540
########## crates/iceberg/src/inspect/snapshots.rs: ########## @@ -0,0 +1,183 @@ +// 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. + +use std::sync::Arc; + +use arrow_array::builder::{MapBuilder, PrimitiveBuilder, StringBuilder}; +use arrow_array::types::{Int64Type, TimestampMillisecondType}; +use arrow_array::RecordBatch; +use arrow_schema::{DataType, Field, Schema, TimeUnit}; + +use crate::table::Table; +use crate::Result; + +/// Snapshots table. +pub struct SnapshotsTable<'a> { + table: &'a Table, +} + +impl<'a> SnapshotsTable<'a> { + /// Create a new Snapshots table instance. + pub fn new(table: &'a Table) -> Self { + Self { table } + } + + /// Returns the schema of the snapshots table. + pub fn schema(&self) -> Schema { Review Comment: Same question as https://github.com/apache/iceberg-rust/issues/868 . But we could defer this to later issue. ########## crates/iceberg/src/inspect/snapshots.rs: ########## @@ -0,0 +1,183 @@ +// 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. + +use std::sync::Arc; + +use arrow_array::builder::{MapBuilder, PrimitiveBuilder, StringBuilder}; +use arrow_array::types::{Int64Type, TimestampMillisecondType}; +use arrow_array::RecordBatch; +use arrow_schema::{DataType, Field, Schema, TimeUnit}; + +use crate::table::Table; +use crate::Result; + +/// Snapshots table. +pub struct SnapshotsTable<'a> { + table: &'a Table, +} + +impl<'a> SnapshotsTable<'a> { + /// Create a new Snapshots table instance. + pub fn new(table: &'a Table) -> Self { + Self { table } + } + + /// Returns the schema of the snapshots table. + pub fn schema(&self) -> Schema { + Schema::new(vec![ + Field::new( + "committed_at", + DataType::Timestamp(TimeUnit::Millisecond, Some("+00:00".into())), + false, + ), + Field::new("snapshot_id", DataType::Int64, false), + Field::new("parent_id", DataType::Int64, true), + Field::new("operation", DataType::Utf8, false), + Field::new("manifest_list", DataType::Utf8, false), + Field::new( + "summary", + DataType::Map( + Arc::new(Field::new( + "entries", + DataType::Struct( + vec![ + Field::new("keys", DataType::Utf8, false), + Field::new("values", DataType::Utf8, true), + ] + .into(), + ), + false, + )), + false, + ), + false, + ), + ]) + } + + /// Scans the snapshots table. + pub fn scan(&self) -> Result<RecordBatch> { Review Comment: Same as #870 ########## crates/iceberg/src/inspect/metadata_table.rs: ########## @@ -0,0 +1,99 @@ +// 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. + +use super::{ManifestsTable, SnapshotsTable}; +use crate::table::Table; + +/// Metadata table is used to inspect a table's history, snapshots, and other metadata as a table. +/// +/// References: +/// - <https://github.com/apache/iceberg/blob/ac865e334e143dfd9e33011d8cf710b46d91f1e5/core/src/main/java/org/apache/iceberg/MetadataTableType.java#L23-L39> +/// - <https://iceberg.apache.org/docs/latest/spark-queries/#querying-with-sql> +/// - <https://py.iceberg.apache.org/api/#inspecting-tables> +#[derive(Debug)] +pub struct MetadataTable(Table); Review Comment: I don't quite understand why we need this data struct here. It seems just a wrapper to provide more api, while just like this: ``` impl Table { pub fn snapshots(&self) -> SnapshotsTable { ... } pub fn manifests(&self) -> ManifestsTable { ... } } ``` -- This is an automated message from the Apache Git Service. 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