iceberg_datafusion/table/
metadata_table.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18use std::any::Any;
19use std::sync::Arc;
20
21use async_trait::async_trait;
22use datafusion::arrow::array::RecordBatch;
23use datafusion::arrow::datatypes::SchemaRef as ArrowSchemaRef;
24use datafusion::catalog::Session;
25use datafusion::datasource::{TableProvider, TableType};
26use datafusion::error::Result as DFResult;
27use datafusion::logical_expr::Expr;
28use datafusion::physical_plan::ExecutionPlan;
29use futures::TryStreamExt;
30use futures::stream::BoxStream;
31use iceberg::arrow::schema_to_arrow_schema;
32use iceberg::inspect::MetadataTableType;
33use iceberg::table::Table;
34
35use crate::physical_plan::metadata_scan::IcebergMetadataScan;
36use crate::to_datafusion_error;
37
38/// Represents a [`TableProvider`] for the Iceberg [`Catalog`],
39/// managing access to a [`MetadataTable`].
40#[derive(Debug, Clone)]
41pub struct IcebergMetadataTableProvider {
42    pub(crate) table: Table,
43    pub(crate) r#type: MetadataTableType,
44}
45
46#[async_trait]
47impl TableProvider for IcebergMetadataTableProvider {
48    fn as_any(&self) -> &dyn Any {
49        self
50    }
51
52    fn schema(&self) -> ArrowSchemaRef {
53        let metadata_table = self.table.inspect();
54        let schema = match self.r#type {
55            MetadataTableType::Snapshots => metadata_table.snapshots().schema(),
56            MetadataTableType::Manifests => metadata_table.manifests().schema(),
57        };
58        schema_to_arrow_schema(&schema).unwrap().into()
59    }
60
61    fn table_type(&self) -> TableType {
62        TableType::Base
63    }
64
65    async fn scan(
66        &self,
67        _state: &dyn Session,
68        _projection: Option<&Vec<usize>>,
69        _filters: &[Expr],
70        _limit: Option<usize>,
71    ) -> DFResult<Arc<dyn ExecutionPlan>> {
72        Ok(Arc::new(IcebergMetadataScan::new(self.clone())))
73    }
74}
75
76impl IcebergMetadataTableProvider {
77    pub async fn scan(self) -> DFResult<BoxStream<'static, DFResult<RecordBatch>>> {
78        let metadata_table = self.table.inspect();
79        let stream = match self.r#type {
80            MetadataTableType::Snapshots => metadata_table.snapshots().scan().await,
81            MetadataTableType::Manifests => metadata_table.manifests().scan().await,
82        }
83        .map_err(to_datafusion_error)?;
84        let stream = stream.map_err(to_datafusion_error);
85        Ok(Box::pin(stream))
86    }
87}
iceberg_datafusion/table/metadata_table.rs

iceberg_datafusion/table/
metadata_table.rs
