Github user amansinha100 commented on a diff in the pull request:
https://github.com/apache/drill/pull/794#discussion_r108210211
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/BatchReference.java ---
@@ -0,0 +1,73 @@
+/*
+ * 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.expr;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * Holder class that contains batch naming, batch and record index. Batch
index is used when batch is hyper container.
+ * Used to distinguish batches in non-equi conditions during expression
materialization.
+ * Mostly used for nested loop join which allows non equi-join.
+ *
+ * Example:
+ * BatchReference{batchName='leftBatch', batchIndex='leftIndex',
recordIndex='leftIndex'}
+ * BatchReference{batchName='rightContainer',
batchIndex='rightBatchIndex', recordIndex='rightRecordIndexWithinBatch'}
+ *
+ */
+public final class BatchReference {
--- End diff --
Can you add some comments about when the batch reference should be set ?
for every batch or once per OK_NEW_SCHEMA status ?
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