Strange data model: Depends on the use case.
Can be very sufficient for specific problems. For example data quality checks ELT processes. Filter out email addresses containing specific pattern or domains etc.
Or I used it for very flexible filter rules with multiple columns where not all have to be fully specifed all the time...
True that this is a product join but still quite efficient. But fully agree that this should never be a standard join on normal table.
Ulrich
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