exon 0.32.4

// Copyright 2024 WHERE TRUE Technologies.
//
// 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::sync::Arc;

use datafusion::{
    datasource::{
        file_format::file_compression_type::FileCompressionType, physical_plan::FileOpener,
    },
    error::DataFusionError,
};
use exon_sdf::SDFConfig;
use futures::{StreamExt, TryStreamExt};
use tokio_util::io::StreamReader;

#[derive(Debug)]
pub struct SDFOpener {
    /// The file compression type.
    file_compression_type: FileCompressionType,

    /// The configuration for the opener.
    config: Arc<SDFConfig>,
}

impl SDFOpener {
    /// Create a new SDF file opener.
    pub fn new(config: Arc<SDFConfig>, file_compression_type: FileCompressionType) -> Self {
        Self {
            config,
            file_compression_type,
        }
    }
}

impl FileOpener for SDFOpener {
    fn open(
        &self,
        file_meta: datafusion::datasource::physical_plan::FileMeta,
    ) -> datafusion::error::Result<datafusion::datasource::physical_plan::FileOpenFuture> {
        let config = Arc::clone(&self.config);
        let file_compression_type = self.file_compression_type;

        Ok(Box::pin(async move {
            let get_result = config.object_store.get(file_meta.location()).await?;

            let stream = Box::pin(get_result.into_stream().map_err(DataFusionError::from));
            let stream = file_compression_type.convert_stream(stream)?;
            let stream_reader = StreamReader::new(stream);

            let batch_reader = exon_sdf::BatchReader::new(stream_reader, config);

            let batch_stream = batch_reader.into_stream();
            Ok(batch_stream.boxed())
        }))
    }
}

// std::result::Result<Pin<Box<(dyn futures::Stream<Item = std::result::Result<arrow::array::RecordBatch, arrow::error::ArrowError>> + std::marker::Send + 'static)>>, DataFusionError>`
// std::result::Result<impl futures::Stream<Item = std::result::Result<arrow::array::RecordBatch, arrow::error::ArrowError>>, _>