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Improve dealing with check constraints
This fixes a number of issues for check constaints. First it allows parsing both `DROP CONSTRAINT` and `DROP CHECK` in the parser so we can correctly drop an existing constraint. This was missing so far and only a foreign key constraint could be dropped. Secondly, we improve dealing with constraints in schemadiff as well. Normalization there needs to generate names for constraints much like how we generate names for keys as well. We also need to teach the diffing logic then how to create the proper `DROP` statements instead of a `DROP FOREIGN KEY` for all constraints that get dropped. Signed-off-by: Dirkjan Bussink <d.bussink@gmail.com>
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