mysql: bug fixes (#1195)

Author: venkat1109

common/persistence/persistence-factory/factory.go

@@ -299,7 +299,7 @@ func buildRatelimiters(cfg *config.Persistence) map[string]common.TokenBucket {
 			qps = ds.SQL.MaxQPS
 		}
 		if qps > 0 {
-			result[dsName] = common.NewTokenBucket(ds.Cassandra.MaxQPS, common.NewRealTimeSource())
+			result[dsName] = common.NewTokenBucket(qps, common.NewRealTimeSource())
 		}
 	}
 	return result

schema/mysql/v57/cadence/schema.sql

@@ -237,7 +237,7 @@ task_list                   VARCHAR(255) NOT NULL,
 started_identity            VARCHAR(255) NOT NULL,
 has_retry_policy            BOOLEAN NOT NULL,
 init_interval               INT NOT NULL,
-backoff_coefficient         DOUBLE NOT NULL,
+backoff_coefficient         DOUBLE,
 max_interval                INT NOT NULL,
 expiration_time             TIMESTAMP(3) NOT NULL DEFAULT '1970-01-01 00:00:01.000',
 max_attempts                INT NOT NULL,