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rom-sql's "Relation#exist?" using EXISTS
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| # override original exist? so that it does not use COUNT() | |
| def exist?(*args, &block) | |
| sql = where(*args, &block).dataset.unordered.select(1).exists | |
| db.select(sql.as(:exists)).first[:exists] | |
| end | |
| alias any? exist? | |
| private | |
| def db | |
| dataset.db | |
| end |
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