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You're reading from  Scala Data Analysis Cookbook

Product typeBook
Published inOct 2015
Reading LevelIntermediate
Publisher
ISBN-139781784396749
Edition1st Edition
Languages
Scala
Tools
Apache Spark
Concepts
Data Analysis
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Author (1)
Arun Manivannan
Arun Manivannan
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Arun Manivannan

Arun Manivannan has been an engineer in various multinational companies, tier-1 financial institutions, and start-ups, primarily focusing on developing distributed applications that manage and mine data. His languages of choice are Scala and Java, but he also meddles around with various others for kicks. He blogs at http://rerun.me. Arun holds a master's degree in software engineering from the National University of Singapore. He also holds degrees in commerce, computer applications, and HR management. His interests and education could probably be a good dataset for clustering.
Read more about Arun Manivannan

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Manipulating DataFrames

In the previous recipe, we saw how to create a DataFrame. The next natural step, after creating DataFrames, is to play with the data inside them. Other than the numerous functions that help us to do that, we also find other interesting functions that help us sample the data, print the schema of the data, and so on. We'll take a look at them one by one in this recipe.

Note

The code and the sample file for this recipe could be found at https://github.com/arunma/ScalaDataAnalysisCookbook/blob/master/chapter1-spark-csv/src/main/scala/com/packt/scaladata/spark/csv/DataFrameCSV.scala.

How to do it...

Now, let's see how we can manipulate DataFrames using the following subrecipes:

  • Printing the schema of the DataFrame

  • Sampling data in the DataFrame

  • Selecting specific columns in the DataFrame

  • Filtering data by condition

  • Sorting data in the frame

  • Renaming columns

  • Treating the DataFrame as a relational table to execute SQL queries

  • Saving the DataFrame as a file

Printing the schema of the...

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Scala Data Analysis Cookbook
Published in: Oct 2015Publisher: ISBN-13: 9781784396749
© 2015 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Arun Manivannan

Arun Manivannan has been an engineer in various multinational companies, tier-1 financial institutions, and start-ups, primarily focusing on developing distributed applications that manage and mine data. His languages of choice are Scala and Java, but he also meddles around with various others for kicks. He blogs at http://rerun.me. Arun holds a master's degree in software engineering from the National University of Singapore. He also holds degrees in commerce, computer applications, and HR management. His interests and education could probably be a good dataset for clustering.
Read more about Arun Manivannan

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