feat: try out temporary views in staging query

[tchow-zlai]

Summary

• Staging query should in theory already work for external tables without additional code changes as long as we do some setup work to pin up a view first.

Checklist

• Added Unit Tests
• Covered by existing CI
• Integration tested
• Documentation update

Summary by CodeRabbit

• New Features

  • Updated data queries to focus on checkout records and incorporate a new temporary view sourced from cloud storage.

• Refactor

  • Optimized initialization by deferring the setup process until required, ensuring smoother operations.

• Bug Fixes

  • Enhanced query configurations to handle missing information robustly, reducing potential runtime issues.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

This pull request updates the SQL query and staging setup in the Python file to focus on checkout data instead of purchase data. The query now selects return_id and refund_amt from a different table and includes a new temporary view setup. Additionally, two Scala files have been modified: one updates a variable from an eager to a lazy initialization, and the other enhances null safety in engine type checking.

Changes

File(s)	Change Summary
api/py/test/.../checkouts_external.py	SQL query modified to select return_id and refund_amt from checkouts_external instead of purchase details; StagingQuery instantiation now uses name='checkouts_staging_query' and adds a new setups parameter to create a temporary view using a Parquet file.
spark/src/main/scala/ai/chronon/spark/Driver.scala	Changed fetchContext from an eagerly evaluated val to a lazy val, deferring its initialization until first accessed.
spark/src/main/scala/ai/chronon/spark/StagingQuery.scala	Modified the engine type check in computeStagingQuery to wrap the value in an Option and use getOrElse, defaulting to EngineType.SPARK to prevent NullPointerExceptions.

Sequence Diagram(s)

sequenceDiagram
    participant SQ as StagingQuery Instance
    participant TV as Temporary View Setup
    participant DB as Data Source
    SQ->>TV: Execute "CREATE OR REPLACE TEMPORARY VIEW" command
    TV-->>SQ: Temporary view created
    SQ->>DB: Execute updated SQL query on "checkouts_external"
    DB-->>SQ: Return query results

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Suggested reviewers

• nikhil-zlai
• piyush-zlai
• varant-zlai

Poem

In the realm of code, a change takes flight,
Checkout data gleams with renewed light.
Lazy initialization wakes on demand,
Safe checks ensure our engines withstand.
A dance of queries and views so bright.
🚀✨ CodeRabbit leaps with might!

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
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📥 Commits

Reviewing files that changed from the base of the PR and between f473147 and 510fad8.

📒 Files selected for processing (3)

• api/py/test/sample/staging_queries/quickstart/checkouts_external.py (1 hunks)
• spark/src/main/scala/ai/chronon/spark/Driver.scala (1 hunks)
• spark/src/main/scala/ai/chronon/spark/StagingQuery.scala (1 hunks)

✨ Finishing Touches

• 📝 Generate Docstrings (Beta)

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