GitHub user alamb added a comment to the discussion: Does DataFusion Support 
JSON Path Filtering Like `jsonb_path_exists` in PostgreSQL?

Actually, here is a good example : 
https://github.com/apache/datafusion/blob/87eec43856a5d8cefef24d1ff85d375d2b58d8c2/datafusion/core/tests/user_defined/expr_planner.rs#L35-L124

GitHub link: 
https://github.com/apache/datafusion/discussions/15264#discussioncomment-12523265

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