Don't do it! Not if your application is more than a toy. I get the allure of this kind of approach, but the costs in usability and defense against pathologica

Don't do it! Not if your application is more than a toy. I get the allure of this kind of approach, but the costs in usability and defense against pathological queries (given nontrivial data volumes) are way too heavy to bear for the superficial convenience. And the justifications related to the sorts of problems avoided don't pass the smell test.