PySpark and AWS: Master Big Data with PySpark and AWS - Spark Provide Schema

This video tutorial explains how to create and apply custom schemas in Spark. It begins with an overview of default schema inference and its limitations, particularly when dealing with purely numerical data that should be treated as strings. The tutorial then guides viewers through the process of creating a custom schema using PySpark's StructType and StructField, specifying data types for each column. Finally, it demonstrates how to apply this custom schema to a Spark DataFrame, highlighting the benefits and trade-offs of using custom schemas over default inference.

What steps are involved in specifying a column as nullable in the schema?

What issues can arise from typos in column names when creating a schema?

Explain the significance of the 'infer schema' option when reading data in Spark.