datafusion_dft/extensions/
mod.rs

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// 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 has code to register DataFusion extensions

use crate::config::ExecutionConfig;
use datafusion::common::Result;
use datafusion::prelude::SessionContext;
use std::{fmt::Debug, sync::Arc};

mod builder;
#[cfg(feature = "deltalake")]
mod deltalake;
// #[cfg(feature = "hudi")]
// mod hudi;
#[cfg(feature = "huggingface")]
mod huggingface;
#[cfg(feature = "iceberg")]
mod iceberg;
#[cfg(feature = "s3")]
mod s3;

pub use builder::DftSessionStateBuilder;

#[async_trait::async_trait]
pub trait Extension: Debug {
    /// Registers this extension with the DataFusion [`SessionStateBuilder`]
    async fn register(
        &self,
        _config: ExecutionConfig,
        _builder: &mut DftSessionStateBuilder,
    ) -> Result<()>;

    // Registers this extension after the SessionContext has been created
    // (this is to match the historic way many extensions were registered)
    // TODO file a ticket upstream to use the builder pattern
    fn register_on_ctx(&self, _config: &ExecutionConfig, _ctx: &mut SessionContext) -> Result<()> {
        Ok(())
    }
}

/// Return all extensions currently enabled
pub fn enabled_extensions() -> Vec<Arc<dyn Extension>> {
    vec![
        #[cfg(feature = "s3")]
        Arc::new(s3::AwsS3Extension::new()),
        #[cfg(feature = "deltalake")]
        Arc::new(deltalake::DeltaLakeExtension::new()),
        // #[cfg(feature = "hudi")]
        // Arc::new(hudi::HudiExtension::new()),
        #[cfg(feature = "iceberg")]
        Arc::new(iceberg::IcebergExtension::new()),
        #[cfg(feature = "huggingface")]
        Arc::new(huggingface::HuggingFaceExtension::new()),
    ]
}