Simplify SQL statement

Author: EinKrebs

balancer/provider/balancer.go

@@ -238,8 +238,7 @@ func (b *BalancerImpl) getStatsByKeyRange(ctx context.Context, shard *ShardMetri
 		    comment_keys->>'key_range_id' AS key_range_id,
 			SUM(user_time + system_time) AS cpu
 		FROM (
-		    SELECT * 
-		    FROM pgcs_get_stats_time_interval(now() - interval '%ds', now())
+		    SELECT FROM pgcs_get_stats_time_interval(now() - interval '%ds', now())
 		    WHERE comment_keys->>'key_range_id' IS NOT NULL        
 		) as pg_comment_stats
 		GROUP BY key_range_id;