json_contains NotImplementedError with SQLite - only works with PostgreSQL

[zkanda]

Describe the bug Using field__contains on JSONField with SQLite throws NotImplementedError: must be overridden in each executor. Works fine with PostgreSQL but SQLite just crashes.

To Reproduce https://gist.github.com/zkanda/b6151db1bbe984772be037e431a14604

Expected behavior Either implement it for SQLite or give a proper error message saying "JSON contains not supported with SQLite". Right now it's just a confusing NotImplementedError.

Additional context

• Error happens in filters.py:230 where json_contains isn't implemented for SQLite
• Makes it impossible to write db-agnostic code with JSON fields
• No docs mention this limitation