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Apache Spark installation guides, performance tuning tips, general tutorials, etc.

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In Spark, function to_date can be used to convert string to date. This function is available since Spark 1.5.0. SELECT to_date('2020-10-23', 'yyyy-MM-dd'); SELECT to_date('23Oct2020', 'ddMMMyyyy'); Refer to the official documentation about all the datetime patterns.  ...

.NET for Apache Spark v1.0.0 Released

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access_time 15 days ago

.NET for Apache Spark v1.0.0 was released officially on 2020-10-14. This page summarizes some important resources for you to get started on .NET for Spark. *Image credit: https://github.com/dotnet/spark/raw/master/docs/img/dotnetsparklogo-6.png Release Notes on GitHub ...

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access_time 27 days ago

Recently, one of my colleague asked me one question about Spark: for the same SQL statement on finding max value of partition column, different values are returned in Spark SQL and Hive/Impala SQL. The SQL statement looks like the following: SELECT MAX(PART_COL) FROM HiveDb.TestSQL; ...

local_offer spark local_offer pyspark local_offer how-to local_offer tutorial local_offer spark-dataframe

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access_time 3 months ago

This article shows you how to filter NULL/None values from a Spark data frame using Python. Function DataFrame.filter or DataFrame.where can be used to filter out null values.

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Spark is a robust framework with logging implemented in all modules. Sometimes it might get too verbose to show all the INFO logs. This article shows you how to hide those INFO logs in the console output. Log level can be setup using function pyspark.SparkContext.setLogLevel . The ...

local_offer tutorial local_offer pyspark local_offer spark local_offer how-to local_offer spark-dataframe

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access_time 3 months ago

This article shows how to change column types of Spark DataFrame using Python. For example, convert StringType to DoubleType, StringType to Integer, StringType to DateType. Follow article  Convert Python Dictionary List to PySpark DataFrame to construct a dataframe.

local_offer tutorial local_offer pyspark local_offer spark local_offer how-to local_offer spark-dataframe

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This article shows how to add a constant or literal column to Spark data frame using Python.  Follow article  Convert Python Dictionary List to PySpark DataFrame to construct a dataframe. +----------+---+------+ | Category| ID| Value| +----------+---+------+ |Category A| 1| ...

local_offer tutorial local_offer pyspark local_offer spark local_offer how-to local_offer spark-dataframe

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This article shows how to 'delete' column from Spark data frame using Python.  Follow article  Convert Python Dictionary List to PySpark DataFrame to construct a dataframe. +----------+---+------+ | Category| ID| Value| +----------+---+------+ |Category A| 1| 12.40| |Category B| ...

local_offer tutorial local_offer pyspark local_offer spark local_offer how-to local_offer spark-dataframe

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Column renaming is a common action when working with data frames. In this article, I will show you how to rename column names in a Spark data frame using Python.  The following code snippet creates a DataFrame from a Python native dictionary list. PySpark SQL types are used to create the ...

Apache Spark 3.0.0 Installation on Linux Guide

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access_time 3 months ago

This article provides step by step guide to install the latest version of Apache Spark 3.0.0 on a UNIX alike system (Linux) or Windows Subsystem for Linux (WSL). These instructions can be applied to Ubuntu, Debian, Red Hat, OpenSUSE, MacOS, etc.  If you are planning to configure Spark 3.0 on ...