[GitHub] [arrow-datafusion] Dandandan commented on a change in pull request #11: [DataFusion] Cross join implementation

[GitBox <gi...@apache.org>]

Dandandan commented on a change in pull request #11:
URL: https://github.com/apache/arrow-datafusion/pull/11#discussion_r615808118



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File path: datafusion/src/physical_plan/cross_join.rs
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@@ -0,0 +1,315 @@
+// 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.
+
+//! Defines the join plan for executing partitions in parallel and then joining the results
+//! into a set of partitions.
+
+use futures::{lock::Mutex, StreamExt};
+use std::{any::Any, sync::Arc, task::Poll};
+
+use crate::physical_plan::memory::MemoryStream;
+use arrow::datatypes::{Schema, SchemaRef};
+use arrow::error::Result as ArrowResult;
+use arrow::record_batch::RecordBatch;
+
+use futures::{Stream, TryStreamExt};
+
+use super::{hash_utils::check_join_is_valid, merge::MergeExec};
+use crate::{
+    error::{DataFusionError, Result},
+    scalar::ScalarValue,
+};
+use async_trait::async_trait;
+use std::time::Instant;
+
+use super::{ExecutionPlan, Partitioning, RecordBatchStream, SendableRecordBatchStream};
+use crate::physical_plan::coalesce_batches::concat_batches;
+use log::debug;
+
+/// Data of the left side
+type JoinLeftData = RecordBatch;
+
+/// executes partitions in parallel and combines them into a set of
+/// partitions by combining all values from the left with all values on the right
+#[derive(Debug)]
+pub struct CrossJoinExec {
+    /// left (build) side which gets loaded in memory
+    left: Arc<dyn ExecutionPlan>,
+    /// right (probe) side which are combined with left side
+    right: Arc<dyn ExecutionPlan>,
+    /// The schema once the join is applied
+    schema: SchemaRef,
+    /// Build-side data
+    build_side: Arc<Mutex<Option<JoinLeftData>>>,
+}
+
+impl CrossJoinExec {
+    /// Tries to create a new [CrossJoinExec].
+    /// # Error
+    /// This function errors when it is not possible to join the left and right sides on keys `on`.

Review comment:
       :+1: 




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