Package org.apache.flink.test.recordJobs.relational.query9Util

Source Code of org.apache.flink.test.recordJobs.relational.query9Util.LineItemMap

/*
* 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.flink.test.recordJobs.relational.query9Util;

import org.apache.flink.api.java.record.functions.MapFunction;
import org.apache.flink.test.recordJobs.util.Tuple;
import org.apache.flink.types.Record;
import org.apache.flink.util.Collector;

@SuppressWarnings("serial")
public class LineItemMap extends MapFunction {
 
  /**
   * Filter "lineitem".
   *
   * Output Schema:
   *  Key: orderkey
   *  Value: (partkey, suppkey, quantity, price)
   *
   */
  @Override
  public void map(Record record, Collector<Record> out) throws Exception
  {
    Tuple inputTuple = record.getField(1, Tuple.class);
   
    /* Extract the year from the date element of the order relation: */
   
    /* pice = extendedprice * (1 - discount): */
    float price = Float.parseFloat(inputTuple.getStringValueAt(5)) * (1 - Float.parseFloat(inputTuple.getStringValueAt(6)));
    /* Project (orderkey | partkey, suppkey, linenumber, quantity, extendedprice, discount, tax, ...) to (partkey, suppkey, quantity): */
    inputTuple.project((0 << 0) | (1 << 1) | (1 << 2) | (0 << 3) | (1 << 4));
    inputTuple.addAttribute("" + price);
    record.setField(1, inputTuple);
    out.collect(record);
  }

}
TOP

Related Classes of org.apache.flink.test.recordJobs.relational.query9Util.LineItemMap

TOP
Copyright © 2018 www.massapi.com. All rights reserved.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.