spark-examples / spark-scala-examples Goto Github PK
View Code? Open in Web Editor NEWThis project provides Apache Spark SQL, RDD, DataFrame and Dataset examples in Scala language
Home Page: https://sparkbyexamples.com
This project provides Apache Spark SQL, RDD, DataFrame and Dataset examples in Scala language
Home Page: https://sparkbyexamples.com
TimeInMilli.scala is about timestamps in seconds, not milliseconds.
I ended up here because I am trying to find out how to convert a LongType value like 1582053488123 that represents time since the epoch in milliseconds to a Spark TimestampType.
regarding item: src/main/scala/com/sparkbyexamples/spark/dataframe/examples/DropColumn.scala
I am running these examples in Azure PySpark 3.3 and I noticed that df.drop('colname') does NOT drop the column from the df dataframe. It only removes it from the value returned by the current pyspark statement.
Try these three lines in pyspark:
df.drop("first_name").printSchema() #prints the schema without the first_name column, same as in your examples.
df.drop("first_name"). #run this without displaying output.
df.printSchema(). #prints the schema WITH the first_name column.
Conclusion: the df.drop('col') statement does NOT change the df dataframe.
I have JDK 17 and when I try to run the simple sparksession create, I get the following error:
Unable to make private java.nio.DirectByteBuffer(long,int) accessible: module java.base does not "opens java.nio" to unnamed module
Please, suggest a alernative as JDK 8 soultion doesn't work for me.
A declarative, efficient, and flexible JavaScript library for building user interfaces.
๐ Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
The Web framework for perfectionists with deadlines.
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. ๐๐๐
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
We are working to build community through open source technology. NB: members must have two-factor auth.
Open source projects and samples from Microsoft.
Google โค๏ธ Open Source for everyone.
Alibaba Open Source for everyone
Data-Driven Documents codes.
China tencent open source team.