hadoophivehiveqlhadoop2hive-serde

Can I use 2 fields terminators(like ',' and '.') at a time in hive while creating table?


I have a file with id and year. My fields are separated by , and .. Is there any chance I can in the place of fields terminated by can I use , and .?


Solution

  • This is possible using RegexSerDe.

    hive> CREATE EXTERNAL TABLE citiesr1 (id int, city_org string, ppl float) 
    ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.RegexSerDe' 
    WITH SERDEPROPERTIES ('input.regex'='^(\\d+)\\.(\\S+),(\\d++.\\d++)\\t.*')
    LOCATION '/user/it1/hive/serde/regex';
    

    In the regex above three regex groups are defined.

    (\\d+) leading digits is the int id column
    dot . is a separator
    (\\S+) - string without spaces is the city_org string column
    comma , is a separator
    (\\d++.\\d++) - float column
    \\t - tab separator
    

    See details here: https://community.hortonworks.com/articles/58591/using-regular-expressions-to-extract-fields-for-hi.html