[GitHub] [pinot] walterddr commented on a diff in pull request #9807: [multistage] split out leaf stage operator

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

walterddr commented on code in PR #9807:
URL: https://github.com/apache/pinot/pull/9807#discussion_r1024528387


##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/operator/LeafStageTransferableBlockOperator.java:
##########
@@ -0,0 +1,138 @@
+/**
+ * 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.
+ */
+package org.apache.pinot.query.runtime.operator;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.PriorityQueue;
+import javax.annotation.Nullable;
+import org.apache.pinot.common.datablock.DataBlock;
+import org.apache.pinot.common.datablock.DataBlockUtils;
+import org.apache.pinot.common.datablock.MetadataBlock;
+import org.apache.pinot.common.datatable.DataTable;
+import org.apache.pinot.common.utils.DataSchema;
+import org.apache.pinot.core.common.Operator;
+import org.apache.pinot.core.operator.BaseOperator;
+import org.apache.pinot.core.operator.blocks.InstanceResponseBlock;
+import org.apache.pinot.core.operator.blocks.results.BaseResultsBlock;
+import org.apache.pinot.query.runtime.blocks.TransferableBlock;
+
+
+/**
+ * Leaf-stage transfer block operator is used to wrap around the leaf stage process results. They are passed to the
+ * Pinot server to execute query thus only one {@link DataTable} were returned. However, to conform with the
+ * intermediate stage operators. an additional {@link MetadataBlock} needs to be transfer after the data block.

Review Comment:
   ```suggestion
    * intermediate stage operators. An additional {@link MetadataBlock} needs to be transferred after the data block.
   ```



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