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UDF in Pig

  • Pig UDFs-Pig supported the languages: Java, Python, and JavaScript.
  • It give high importance for Java functions.
  • It include the parts of data load, column transformation, and aggregation.
  • The coder can customize all parts of the processing which including data load, column transformation and aggregation.
  • In addition to pre-defined function, Apache Pig support for User Defined Function.
  • The own function define by User Defined Function.
  • It supports programming languages, like Java, Jython, Python, JavaScript, Ruby and Groovy.
  • For writing User Defined Function, it complete support is provided in Java and limited support providing for remaining languages.
  • Since Apache Pig written in Java, the User Defined Function written using Java language work efficiently compared to all other languages.
  • The coder have a Java repository for User Defined Function is termed as Piggybank.
  • Using Piggybank, the coder access Java User Defined Function written by others, and contribute our own User Defined Function.
Apache Pig UDF

Steps:

  • All User Defined Function must extend "org.apache.pig.EvalFunc"
  • All functions must override "exec" method.
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