Django ORM Table Aliases

Your question about Django ORM's table aliases is quite relevant for query optimization work. While the provided context doesn't directly address the specific naming convention for table aliases like "V0", "U0", and "W1" in the ORM, I can provide some insights based on the available information.

Current Table Naming in Django

Django automatically derives database table names from the model class name and app label. For example, a Book model in a bookstore app would have a table named bookstore_book. This naming convention is documented, but the internal alias generation for complex queries isn't explicitly covered in the provided context.

Regarding Your Proposal

Your suggestion to make table aliases more descriptive (like "original_table_name_V0") could indeed improve query readability and debugging, especially when working with complex queries and EXPLAIN output.

Implementation Considerations

If you're looking to modify this behavior:

1. You would need to explore the ORM's query generation internals, particularly how it handles table aliases in complex queries with joins and subqueries.

2. Any modification would need to ensure that:

   • The aliases remain valid SQL identifiers
   • There are no collisions between aliases
   • The change doesn't break compatibility with different database backends

3. For Oracle databases specifically, you'd need to be mindful of the 30-character limitation on table names, as mentioned in the documentation.

Where to Start

To begin exploring this:

1. Look at the query compiler classes in Django's ORM implementation
2. Examine how table aliases are generated in the SQL compilation process
3. Consider creating a custom query compiler that extends Django's default behavior

Compatibility Notes

If you're developing a patch, be aware that:

• MySQL and MariaDB have specific considerations for table naming (lowercase recommended)
• Oracle has a 30-character limitation and specific quoting requirements
• Your changes should work across all supported database backends

A modification like this would likely need to be carefully tested across different database backends to ensure it doesn't introduce any regressions.