remove Query.exclude(:order_by) in exists? #4692
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`select(1)` with `limit(1)` is sufficient for databases to optimize away the order_by. In some cases removing the `order_by` clause will change the query-plan leading to seq-scans instead of index usage.
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select(1)withlimit(1)is sufficient for databases to optimize away the order_by. In some cases removing theorder_byclause will change the query-plan leading to seq-scans instead of index usage.