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Availability

Earliest version CSVSerde is available

The CSVSerde is available in Hive 0.14 and greater.

Background

The CSV SerDe is based from https://github.com/ogrodnek/csv-serde, and was added to the Hive distribution in HIVE-7777.

 

Limitation

This serde treats all columns to be of type String. Even if you create a table with non string column type using this serde, the describe table output would show string column type. The type information is retrieved from the Serde. To convert them to desired type in a table, you can create a view over the table that does the CAST to desired type.

Usage

This SerDe works for most CSV data, but does not handle embedded newlines. To use the SerDe, specify the fully qualified class name org.apache.hadoop.hive.serde2.OpenCSVSerde.  

Documentation is based on original documentation at https://github.com/ogrodnek/csv-serde.

Create table, specify CSV properties
CREATE TABLE my_table(a string, b string, ...)
ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.OpenCSVSerde'
WITH SERDEPROPERTIES (
   "separatorChar" = "\t",
   "quoteChar"     = "'",
   "escapeChar"    = "\\"
)   
STORED AS TEXTFILE;
Default separator, quote, and escape characters if unspecified
DEFAULT_ESCAPE_CHARACTER \
DEFAULT_QUOTE_CHARACTER  "
DEFAULT_SEPARATOR        ,

For general information about SerDes, see Hive SerDe in the Developer Guide. Also see SerDe for details about input and output processing.

Versions

The CSVSerde has been built and tested against Hive 0.14 and later, and uses Open-CSV 2.3 which is bundled with the Hive distribution.

Hive VersionsOpen-CSV Version
Hive 0.14 and later2.3
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