DRILL-229: N-WAY merging receiver

1 files changed, 49 insertions, 0 deletions

diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/MergingReceiverCreator.java b/exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/MergingReceiverCreator.java
new file mode 100644
index 000000000..4058a7949
--- /dev/null
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/MergingReceiverCreator.java
@@ -0,0 +1,49 @@
+/**
+ * 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.drill.exec.physical.impl;
+
+import org.apache.drill.common.exceptions.ExecutionSetupException;
+import org.apache.drill.exec.ops.FragmentContext;
+import org.apache.drill.exec.physical.config.MergingReceiverPOP;
+import org.apache.drill.exec.physical.impl.mergereceiver.MergingRecordBatch;
+import org.apache.drill.exec.record.RecordBatch;
+import org.apache.drill.exec.work.batch.IncomingBuffers;
+import org.apache.drill.exec.work.batch.RawBatchBuffer;
+
+import java.util.List;
+
+public class MergingReceiverCreator implements BatchCreator<MergingReceiverPOP> {
+  static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(MergingReceiverCreator.class);
+
+  @Override
+  public RecordBatch getBatch(FragmentContext context,
+                              MergingReceiverPOP receiver,
+                              List<RecordBatch> children)
+      throws ExecutionSetupException {
+
+    assert children == null || children.isEmpty();
+    IncomingBuffers bufHolder = context.getBuffers();
+
+    assert bufHolder != null : "IncomingBuffers must be defined for any place a receiver is declared.";
+    RawBatchBuffer[] buffers = bufHolder.getBuffers(receiver.getOppositeMajorFragmentId());
+
+    return new MergingRecordBatch(context, receiver, buffers);
+  }
+  
+  
+}