PySpark 4.0 in Python: A Practical 2026 Guide to Spark Connect, ANSI Mode, and the Python Data Source API
A hands-on 2026 walkthrough of PySpark 4.0: Spark Connect from your IDE, custom data sources in pure Python, ANSI mode by default, VARIANT, polymorphic UDTFs, and how to migrate an existing Spark 3.5 pipeline without breaking overnight jobs.