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Apache Hive Cookbook

You're reading from   Apache Hive Cookbook

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Product type Paperback
Published in Apr 2016
Publisher Packt
ISBN-13 9781782161080
Length 268 pages
Edition 1st Edition
Languages
Tools
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Toc

Table of Contents (14) Chapters Close

Preface 1. Developing Hive FREE CHAPTER 2. Services in Hive 3. Understanding the Hive Data Model 4. Hive Data Definition Language 5. Hive Data Manipulation Language 6. Hive Extensibility Features 7. Joins and Join Optimization 8. Statistics in Hive 9. Functions in Hive 10. Hive Tuning 11. Hive Security 12. Hive Integration with Other Frameworks Index

Using built-in functions


There are various built-in functions available in Hive that can be used in queries for executing various operations. These functions are used to extract or manipulate data in Hive tables.

Built-in functions are divided into the following categories:

  • Mathematical functions

  • Collection functions

  • Type conversion functions

  • Date functions

  • String functions

  • Conditional functions

  • Miscellaneous functions

How to do it…

In the following sections, a few built-in functions are explained.

Mathematical functions

Hive supports various functions to run some mathematical operations on field values. There are a large number of mathematical functions available in Hive that can be used in queries. Most of the mathematical functions are the same as supported in RDBMS:

Function Name

Return Type

Description

abs(DOUBLE x)

DOUBLE

It will return an absolute value of x.

acos(DOUBLE x), acos(DECIMAL x)

DOUBLE

It will return an arc cosine value of x if the value of x is equal to or between -1 and...

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