Currently you can create NOT ENFORCED primary keys but the optimizer will then always treat these as trusted. This causes problems when the constraint is violated but a filter includes all PK columns since the engine will return only one row even though multiple rows may exist.
|Who would benefit from this IDEA?||Customers migrating from Netezza, customers whose data modelers want to have the constraints defined for all business objects, customers who have reporting tools.|
How should it work?
The change would be to allow the "NOT TRUSTED" clause to be specified for primary key constraints. This would work like other similar informational constraints - they are there for data modeling tools and not as much for the optimizer.
|Priority Justification||Many customers are currently migrating from Netezza which already has this functionality|
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