Migration Guide

Quick Swap

# from pyspark.sql import SparkSession
from sparkless.sql import SparkSession as SparkSession, functions as F, Window

Common Patterns

• Keep DataFrame APIs unchanged (select, filter, withColumn, groupBy)

• Replace Window with sparkless.Window if imported directly

• Exceptions: use AnalysisException semantics for missing columns

Tips

• Use validation_mode="strict" to catch schema mismatches

• Use session benchmark_operation for performance checks

• Use clear_cache() between tests to control memory