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由 Ryuta Kamizono 提交于
`relation.exists?` just wants to know if there is a result or not, does not need the exact records matched. Therefore, an intermediate SELECT query for eager loading is not necessary.
b4f64cb1
`relation.exists?` just wants to know if there is a result or not, does not need the exact records matched. Therefore, an intermediate SELECT query for eager loading is not necessary.