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Business Intelligence with Databricks SQL

You're reading from   Business Intelligence with Databricks SQL Concepts, tools, and techniques for scaling business intelligence on the data lakehouse

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Product type Paperback
Published in Sep 2022
Publisher Packt
ISBN-13 9781803235332
Length 348 pages
Edition 1st Edition
Languages
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Author (1):
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Vihag Gupta Vihag Gupta
Author Profile Icon Vihag Gupta
Vihag Gupta
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Table of Contents (21) Chapters Close

Preface 1. Part 1: Databricks SQL on the Lakehouse
2. Chapter 1: Introduction to Databricks FREE CHAPTER 3. Chapter 2: The Databricks Product Suite – A Visual Tour 4. Chapter 3: The Data Catalog 5. Chapter 4: The Security Model 6. Chapter 5: The Workbench 7. Chapter 6: The SQL Warehouses 8. Chapter 7: Using Business Intelligence Tools with Databricks SQL 9. Part 2: Internals of Databricks SQL
10. Chapter 8: The Delta Lake 11. Chapter 9: The Photon Engine 12. Chapter 10: Warehouse on the Lakehouse 13. Part 3: Databricks SQL Commands
14. Chapter 11: SQL Commands – Part 1 15. Chapter 12: SQL Commands – Part 2 16. Part 4: TPC-DS, Experiments, and Frequently Asked Questions
17. Chapter 13: Playing with the TPC-DS Dataset 18. Chapter 14: Ask Me Anything 19. Index 20. Other Books You May Enjoy

Discussing the Photon product roadmap

Photon is a brand-new query engine. As we saw in the previous section, it must implement vectorized kernels for all operations that are possible in Apache Spark. At the time of writing, there are still a few operations that are not available with Photon:

  • Photon Scan and Write operators work with Delta and Parquet files only
  • Window and Sort operations are not yet supported
  • User-defined functions are not yet supported
  • Spark Structured Streaming is not yet supported

Work is in progress on all of these and I recommend that you visit https://docs.databricks.com/runtime/photon.html#limitations for the latest status.

That said, does this mean that you cannot use Window and Sort operations with Databricks SQL or that you cannot use your own user-defined functions in Databricks SQL?

You can! Recall Figure 9.3. It shows that the tasks scheduled by Spark are executed by Photon or JVM-Core as applicable. If an operation is...

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