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  * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.pig.builtin;
LOWER implements eval function to convert a string to lower case Example: A = load 'mydata' as (name); B = foreach A generate LOWER(name);
public class LOWER extends EvalFunc<String> {

Method invoked on every tuple during foreach evaluation

input tuple; first column is assumed to have the column to convert
    public String exec(Tuple inputthrows IOException {
        if (input == null || input.size() == 0)
            return null;
        try {
            String str = (String)input.get(0);
            return str.toLowerCase();
        } catch(Exception e){
            warn("Failed to process input; error - " + e.getMessage(), .);
            return null;

This method gives a name to the column.

input - schema of the input data
schema of the input data
    public Schema outputSchema(Schema input) {
        return new Schema(new Schema.FieldSchema(getSchemaName(this.getClass().getName().toLowerCase(), input), .));
     /* (non-Javadoc)
      * @see org.apache.pig.EvalFunc#getArgToFuncMapping()
     public List<FuncSpecgetArgToFuncMapping() throws FrontendException {
        List<FuncSpecfuncList = new ArrayList<FuncSpec>();
        funcList.add(new FuncSpec(this.getClass().getName(), new Schema(new Schema.FieldSchema(null.))));
        return funcList;
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