Github user chaithu14 commented on a diff in the pull request:
https://github.com/apache/apex-malhar/pull/330#discussion_r73141502
--- Diff:
library/src/main/java/com/datatorrent/lib/join/AbstractInnerJoinOperator.java
---
@@ -0,0 +1,331 @@
+/**
+ * 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 com.datatorrent.lib.join;
+
+import java.util.Arrays;
+import java.util.List;
+
+import javax.validation.constraints.NotNull;
+
+import org.apache.apex.malhar.lib.state.spillable.Spillable;
+import
org.apache.apex.malhar.lib.state.spillable.SpillableComplexComponent;
+import
org.apache.apex.malhar.lib.state.spillable.inmem.InMemSpillableComplexComponent;
+import com.google.common.base.Preconditions;
+
+import com.datatorrent.api.AutoMetric;
+import com.datatorrent.api.Context;
+import com.datatorrent.common.util.BaseOperator;
+
+/**
+ * <p>
+ * An abstract implementation of inner join operator. Operator receives
tuples from two streams,
+ * applies the join operation based on constraint and emit the joined
value.
+ * Concrete classes should provide implementation to extractKey,
extractTime, mergeTuples methods.
+ *
+ * <b>Properties:</b><br>
+ * <b>includeFieldStr</b>: List of comma separated fields to be added to
the output tuple.
+ * Ex: Field1,Field2;Field3,Field4<br>
+ * <b>keyFields</b>: List of comma separated key field for both the
streams. Ex: Field1,Field2<br>
+ * <b>timeFields</b>: List of comma separated time field for both the
streams. Ex: Field1,Field2<br>
--- End diff --
Yes. It can be. If the timeField of the stream is not in milliseconds then
the user has to override the extractTime() method and convert the field into
milliseconds.
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