feat: Depend on the lightweight Spark Connect client

[medb]

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[gemini-code-assist]

Summary of Changes

Hello @medb, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on optimizing the project's dependency management by switching to a more lightweight Spark Connect client. Concurrently, it updates the associated unit tests to reflect a more generalized approach to handling Spark SQL data source properties, ensuring compatibility and correctness with the updated client and configuration patterns.

Highlights

• Dependency Update: The project's dependencies have been updated to use the lightweight pyspark-client package instead of the full pyspark[connect] package. This change is reflected in both requirements-dev.txt and setup.py.
• Test Refactoring: Unit tests in test_session.py have been refactored to align with changes in Spark Connect configuration property handling. Specifically, assertions related to spark.datasource.bigquery.writeMethod and spark.datasource.bigquery.viewsEnabled have been replaced or removed in favor of the more general spark.sql.sources.default property.

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[gemini-code-assist]

Code Review

This pull request correctly updates the project's dependencies to use the lightweight pyspark-client instead of the full pyspark[connect], which is a positive change for reducing the package size. The modifications in requirements-dev.txt and setup.py are appropriate. However, my review of tests/unit/test_session.py has identified a critical issue where a test assertion will cause the build to fail due to a logical contradiction. Additionally, another test has been weakened and no longer fully validates the behavior of the code it's supposed to test. Please see my detailed comments for suggestions on how to resolve these issues.