Github user Ben-Zvi commented on a diff in the pull request:
https://github.com/apache/drill/pull/717#discussion_r98589228
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/xsort/managed/CopierHolder.java
---
@@ -0,0 +1,294 @@
+/*
+ * 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.xsort.managed;
+
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.drill.common.exceptions.UserException;
+import org.apache.drill.common.expression.SchemaPath;
+import org.apache.drill.exec.exception.SchemaChangeException;
+import org.apache.drill.exec.expr.TypeHelper;
+import org.apache.drill.exec.memory.BufferAllocator;
+import org.apache.drill.exec.ops.FragmentContext;
+import
org.apache.drill.exec.physical.impl.xsort.managed.ExternalSortBatch.SortResults;
+import org.apache.drill.exec.record.BatchSchema;
+import org.apache.drill.exec.record.MaterializedField;
+import org.apache.drill.exec.record.VectorAccessible;
+import org.apache.drill.exec.record.VectorContainer;
+import org.apache.drill.exec.record.VectorWrapper;
+import org.apache.drill.exec.vector.ValueVector;
+
+import com.google.common.base.Stopwatch;
+
+/**
+ * Manages a {@link PriorityQueueCopier} instance produced from code
generation.
+ * Provides a wrapper around a copier "session" to simplify reading batches
+ * from the copier.
+ */
+
+public class CopierHolder {
+ private static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(CopierHolder.class);
+
+ private PriorityQueueCopier copier;
+
+ private final FragmentContext context;
+ private final BufferAllocator allocator;
+ private OperatorCodeGenerator opCodeGen;
+
+ public CopierHolder(FragmentContext context, BufferAllocator allocator,
OperatorCodeGenerator opCodeGen) {
+ this.context = context;
+ this.allocator = allocator;
+ this.opCodeGen = opCodeGen;
+ }
+
+ /**
+ * Start a merge operation using a temporary vector container. Used for
+ * intermediate merges.
+ *
+ * @param schema
+ * @param batchGroupList
+ * @param targetRecordCount
+ * @return
+ */
+
+ public CopierHolder.BatchMerger startMerge(BatchSchema schema, List<?
extends BatchGroup> batchGroupList, int targetRecordCount) {
+ return new BatchMerger(this, schema, batchGroupList,
targetRecordCount);
+ }
+
+ /**
+ * Start a merge operation using the specified vector container. Used for
+ * the final merge operation.
+ *
+ * @param schema
+ * @param batchGroupList
+ * @param outputContainer
+ * @param targetRecordCount
+ * @return
+ */
+ public CopierHolder.BatchMerger startFinalMerge(BatchSchema schema,
List<? extends BatchGroup> batchGroupList, VectorContainer outputContainer, int
targetRecordCount) {
+ return new BatchMerger(this, schema, batchGroupList, outputContainer,
targetRecordCount);
+ }
+
+ /**
+ * Prepare a copier which will write a collection of vectors to disk.
The copier
+ * uses generated code to to the actual writes. If the copier has not
yet been
--- End diff --
"t" --> "d"
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