Using Spark SQL spark.read.json("path") you can read a JSON file from Amazon S3 bucket, HDFS, Local file system, and many other file systems supported by Spark. Similarly using write.json("path") method of DataFrame you can save or write DataFrame in JSON format to Amazon S3 bucket. In this tutorial, you will…
PySpark SQL provides read.json("path") to read a single line or multiline (multiple lines) JSON file into PySpark DataFrame and write.json("path") to save or write to JSON file, In this tutorial, you will learn how to read a single file, multiple files, all files from a directory into DataFrame and writing DataFrame back to JSON…
PySpark StructType & StructField classes are used to programmatically specify the schema to the DataFrame and creating complex columns like nested struct, array and map columns. StructType is a collection of StructField's that defines column name, column data type, boolean to specify if the field can be nullable or not…
PySpark provides csv("path") on DataFrameReader to read a CSV file into PySpark DataFrame and dataframeObj.write.csv("path") to save or write to the CSV file. In this tutorial, you will learn how to read a single file, multiple files, all files from a local directory into DataFrame, applying some transformations, and finally…
Spark SQL provides spark.read.csv("path") to read a CSV file from Amazon S3, local file system, hdfs, and many other data sources into Spark DataFrame and dataframe.write.csv("path") to save or write DataFrame in CSV format to Amazon S3, local file system, HDFS, and many other data sources. In this tutorial you…
By default Spark SQL infer schema while reading JSON file, but, we can ignore this and read a JSON with schema (user-defined) using spark.read.schema("schema") method. What is Spark Schema Spark Schema defines the structure of the data (column name, datatype, nested columns, nullable e.t.c), and when it specified while reading…
Working with JSON files in Spark Spark SQL provides spark.read.json("path") to read a single line and multiline (multiple lines) JSON file into Spark DataFrame and dataframe.write.json("path") to save or write to JSON file, In this tutorial, you will learn how to read a single file, multiple files, all files from a directory into DataFrame…
Spark SQL provides spark.read.csv("path") to read a CSV file into Spark DataFrame and dataframe.write.csv("path") to save or write to the CSV file. Spark supports reading pipe, comma, tab, or any other delimiter/seperator files. In this tutorial, you will learn how to read a single file, multiple files, all files from…
Spark SQL provides Encoders to convert case class to the spark schema (struct StructType object), If you are using older versions of Spark, you can create spark schema from case class using the Scala hack. Both options are explained here with examples. First, let's create a case class "Name" &…
Spark Schema defines the structure of the DataFrame which you can get by calling printSchema() method on the DataFrame object. Spark SQL provides StructType & StructField classes to programmatically specify the schema. By default, Spark infers the schema from the data, however, sometimes we may need to define our own…