Hive建表出现 LINES TERMINATED BY only supports newline '\n' right now.解决办法

Hive建表语句如下：

CREATE EXTERNAL  TABLE IF NOT EXISTS 
students ( id int, name string, gender string, birthday Date, clazz string, phone string, loc string) 
COMMENT 'student details' 
ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t' 
LINES TERMINATED BY '\r\n' STORED AS TEXTFILE;

FAILED: SemanticException 5:20 LINES TERMINATED BY only supports newline '\n' right now. Error encountered near token ''\r\n''

这个的大意是仅支持 ‘\n’ 作为行分割符，（不太理解，现在hive到2点多的版本为什么还不支持自定义行分隔符，不支持为什么还设置这个LINES TERMINATED BY 配置）
但如果我们的内容必须要其他分割符，我们可以通过设置mapred来间接设置分割符。

在hive cil中输入：set textinputformat.record.linesep=\r\n;

建表语句可以中别写 LINES TERMINATED BY

CREATE EXTERNAL  TABLE IF NOT EXISTS 
students ( id int, name string, gender string, birthday Date, clazz string, phone string, loc string) 
COMMENT 'student details' 
ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t' 
STORED AS TEXTFILE;

完美解决，加载数据，显示正常；

原因：在 hive cil 中输入 describe extended students ;

里面有两条重要信息：
inputFormat:org.apache.hadoop.mapred.TextInputFormat,
outputFormat:org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat,
这表示：
默认状态下，hive的输入和输出调用的类。
类TextInputFormat在hadoop-mapreduce-client-core-***.jar中。
重点看类中getRecordReader方法，该方法返回LineRecordReader对象。并且该方法中已经实现了接收自定义字符串作为换行符的代码，只要建表前在hive的CLI界面上输入set textinputformat.record.delimiter=<自定义换行字符串>;即可实现自定义多字符换行符。

public class TextInputFormat extends FileInputFormat<LongWritable, Text>
  implements JobConfigurable {

  * * * 

  public RecordReader<LongWritable, Text> getRecordReader( InputSplit genericSplit, JobConf job,Reporter reporter)  throws IOException {
      reporter.setStatus(genericSplit.toString());
    String delimiter = job.get("textinputformat.record.delimiter");
    byte[] recordDelimiterBytes = null;
    if (null != delimiter) {
      recordDelimiterBytes = delimiter.getBytes(Charsets.UTF_8);
    }
    return new LineRecordReader(job, (FileSplit) genericSplit,   recordDelimiterBytes);
  }
}