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Apache Hive Essentials - Second Edition
book

Apache Hive Essentials - Second Edition

by Dayong Du
June 2018
Beginner to intermediate content levelBeginner to intermediate
210 pages
5h 12m
English
Packt Publishing
Content preview from Apache Hive Essentials - Second Edition

File format

Hive supports TEXTFILE, SEQUENCEFILE, AVRORCFILE, ORC, and PARQUET file formats. There are two HQL statements used to specify the file format as follows:

  • CREATE TABLE ... STORE AS <file_format>: Specify the file format when creating a table
  • ALTER TABLE ... [PARTITION partition_spec] SET FILEFORMAT <file_format>: Modify the file format (definition only) in an existing table

Once a table stored in text format is created, we can load text data directly into it. To load text data into tables that have other file formats, we can first load the data into a table stored as text, where we use INSERT OVERWRITE/INTO TABLE ... SELECT to select data from it and then insert the data into the tables that have other file formats. 

To change ...
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Publisher Resources

ISBN: 9781788995092Supplemental Content