Github user gauravgopi123 commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/113#discussion_r45860044
--- Diff:
library/src/main/java/com/datatorrent/lib/join/AbstractJoinOperator.java ---
@@ -0,0 +1,341 @@
+/*
+ * Copyright (c) 2014 DataTorrent, Inc. ALL Rights Reserved.
+ *
+ * Licensed 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 com.datatorrent.lib.join;
+
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.List;
+
+import org.apache.hadoop.classification.InterfaceStability.Evolving;
+
+import com.datatorrent.api.Context;
+import com.datatorrent.api.DefaultInputPort;
+import com.datatorrent.api.DefaultOutputPort;
+import com.datatorrent.api.Operator;
+import com.datatorrent.api.annotation.InputPortFieldAnnotation;
+import com.datatorrent.common.util.BaseOperator;
+
+/**
+ * <p>
+ * This is the base implementation of join operator. Operator receives
tuples from multiple streams,
--- End diff --
It is from two streams?
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