Github user chandnisingh commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-malhar/pull/51#discussion_r45286713
  
    --- Diff: 
library/src/test/java/com/datatorrent/lib/join/AntiJoinOperatorTest.java ---
    @@ -0,0 +1,124 @@
    +/**
    + * 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 com.datatorrent.lib.streamquery.condition.Condition;
    +import com.datatorrent.lib.streamquery.condition.JoinColumnEqualCondition;
    +import com.datatorrent.lib.streamquery.index.ColumnIndex;
    +import com.datatorrent.lib.testbench.CollectorTestSink;
    +import com.datatorrent.lib.util.TestUtils;
    +
    +import org.junit.Test;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import java.util.HashMap;
    +
    +/**
    + *
    + * Functional test for {@link AntiJoinOperator }.
    + *
    + */
    +public class AntiJoinOperatorTest
    +{
    +  //@SuppressWarnings({"rawtypes", "unchecked"})
    +  @Test
    +  public void testSqlSelect()
    +  {
    +    Logger LOG = LoggerFactory.getLogger(AntiJoinOperator.class);
    +
    +    // create operator
    +    AntiJoinOperator oper = new AntiJoinOperator();
    +    CollectorTestSink sink = new CollectorTestSink();
    +    TestUtils.setSink(oper.outport, sink);
    +
    +    // set column join condition
    +    Condition cond = new JoinColumnEqualCondition("a", "a");
    +    oper.setJoinCondition(cond);
    +
    +    // add columns
    +    oper.selectTable1Column(new ColumnIndex("b", null));
    +    oper.selectTable1Column(new ColumnIndex("c", null));
    +
    +    oper.setup(null);
    +    HashMap<String, Object> tuple = new HashMap<String, Object>();
    +
    +    // test 1, positive result
    +    oper.beginWindow(1);
    +    tuple.put("a", 0);
    +    tuple.put("b", 1);
    +    tuple.put("c", 2);
    +    oper.inport1.process(tuple);
    +
    +    tuple = new HashMap<String, Object>();
    +    tuple.put("a", 1);
    +    tuple.put("b", 3);
    +    tuple.put("c", 4);
    +    oper.inport1.process(tuple);
    +
    +    tuple = new HashMap<String, Object>();
    +    tuple.put("a", 0);
    +    tuple.put("b", 7);
    +    tuple.put("c", 8);
    +    oper.inport2.process(tuple);
    +
    +    tuple = new HashMap<String, Object>();
    +    tuple.put("a", 2);
    +    tuple.put("b", 5);
    +    tuple.put("c", 6);
    +    oper.inport2.process(tuple);
    +
    +    oper.endWindow();
    +
    +    // expected anti-joined result: {b=3, c=4}
    +    LOG.info("anti-join result: " + sink.collectedTuples.toString());
    --- End diff --
    
    This needs to be an assertion instead of logging. Say in future with 
changes to the operator, a bug is introduced. With assertions we can verifying 
that the existing functionality is not broken. By just logging we will not be 
able to do so.


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