Hive建表出現 LINES TERMINATED BY only supports newline '\n' right now.解決辦法

Hive建表語句如下：

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''

這個的大意是僅支持 ‘\n’ 作爲行分割符，（不太理解，現在hive到2點多的版本爲什麼還不支持自定義行分隔符，不支持爲什麼還設置這個LINES TERMINATED BY 配置）
但如果我們的內容必須要其他分割符，我們可以通過設置mapred來間接設置分割符。

在hive cil中輸入：set textinputformat.record.linesep=\r\n;

建表語句可以中別寫 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;

完美解決，加載數據，顯示正常；

原因：在 hive cil 中輸入 describe extended students ;

裏面有兩條重要信息：
inputFormat:org.apache.hadoop.mapred.TextInputFormat,
outputFormat:org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat,
這表示：
默認狀態下，hive的輸入和輸出調用的類。
類TextInputFormat在hadoop-mapreduce-client-core-***.jar中。
重點看類中getRecordReader方法，該方法返回LineRecordReader對象。並且該方法中已經實現了接收自定義字符串作爲換行符的代碼，只要建表前在hive的CLI界面上輸入set textinputformat.record.delimiter=<自定義換行字符串>;即可實現自定義多字符換行符。

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);
  }
}