re_datafusion/
search_provider.rs

use std::sync::Arc;

use arrow::{array::RecordBatch, datatypes::SchemaRef};
use async_trait::async_trait;
use datafusion::{
    catalog::TableProvider,
    error::{DataFusionError, Result as DataFusionResult},
};
use tokio_stream::StreamExt as _;

use re_grpc_client::redap::RedapClient;
use re_log_encoding::codec::wire::decoder::Decode as _;
use re_protos::{
    common::v1alpha1::ScanParameters, frontend::v1alpha1::SearchDatasetRequest,
    manifest_registry::v1alpha1::SearchDatasetResponse,
};

use crate::grpc_streaming_provider::{GrpcStreamProvider, GrpcStreamToTable};
use crate::wasm_compat::make_future_send;

#[derive(Debug, Clone)]
pub struct SearchResultsTableProvider {
    client: RedapClient,
    request: SearchDatasetRequest,
}

impl SearchResultsTableProvider {
    pub fn new(
        client: RedapClient,
        request: SearchDatasetRequest,
    ) -> Result<Self, DataFusionError> {
        if request.scan_parameters.is_some() {
            return Err(DataFusionError::External(
                "Scan parameters are not supported for SearchResultsTableProvider".into(),
            ));
        }

        Ok(Self { client, request })
    }

    /// This is a convenience function
    pub async fn into_provider(self) -> Result<Arc<dyn TableProvider>, DataFusionError> {
        Ok(GrpcStreamProvider::prepare(self).await?)
    }
}

#[async_trait]
impl GrpcStreamToTable for SearchResultsTableProvider {
    type GrpcStreamData = SearchDatasetResponse;

    async fn fetch_schema(&mut self) -> DataFusionResult<SchemaRef> {
        let mut request = self.request.clone();
        request.scan_parameters = Some(ScanParameters {
            limit_len: Some(0),
            ..Default::default()
        });

        let mut client = self.client.clone();

        let schema = make_future_send(async move {
            Ok::<_, DataFusionError>(
                client
                    .search_dataset(request)
                    .await
                    .map_err(|err| DataFusionError::External(Box::new(err)))?
                    .into_inner()
                    .next()
                    .await,
            )
        })
        .await?
        .ok_or(DataFusionError::Execution(
            "Empty stream from search results".to_owned(),
        ))?
        .map_err(|err| DataFusionError::External(Box::new(err)))?
        .data
        .ok_or(DataFusionError::Execution(
            "Empty data from search results".to_owned(),
        ))?
        .decode()
        .map_err(|err| DataFusionError::External(Box::new(err)))?
        .schema();

        Ok(schema)
    }

    async fn send_streaming_request(
        &mut self,
    ) -> DataFusionResult<tonic::Response<tonic::Streaming<Self::GrpcStreamData>>> {
        let request = self.request.clone();

        let mut client = self.client.clone();

        make_future_send(async move { Ok(client.search_dataset(request).await) })
            .await?
            .map_err(|err| DataFusionError::External(Box::new(err)))
    }

    fn process_response(
        &mut self,
        response: Self::GrpcStreamData,
    ) -> DataFusionResult<RecordBatch> {
        response
            .data
            .ok_or(DataFusionError::Execution(
                "DataFrame missing from SearchDataResponse response".to_owned(),
            ))?
            .decode()
            .map_err(|err| DataFusionError::External(Box::new(err)))
    }
}
re_datafusion/search_provider.rs

re_datafusion/
search_provider.rs
