为提高效率，提问时请提供以下信息，问题描述清晰可优先响应。
- 【TiDB 版本】：V3.0.8
- 【问题描述】：
2020/04/08 21:00:27 ddl.go:110: [warning] will split alter table statement: ALTER TABLE dyaccount._user_extend_new ADD index idx_userpin(user_pin)
2020/04/08 21:00:27 ast.go:521: [info] spec &{node:{text:} IfExists:false IfNotExists:false NoWriteToBinlog:false OnAllPartitions:false Tp:3 Name: Constraint:0xc0002ceb60 Options:[] OrderByList:[] NewTable: NewColumns:[] NewConstraints:[] OldColumnName: NewColumnName: Position: LockType: Algorithm:DEFAULT Comment: FromKey: ToKey: Partition: PartitionNames:[] PartDefinitions:[] WithValidation:false Num:0 Visibility:0 TiFlashReplica:}
2020/04/08 21:00:27 ddl.go:114: [warning] splitted alter table statement: [ALTER TABLE dyaccount._user_extend_new ADD INDEX idx_userpin (user_pin)]
2020/04/08 21:00:27 syncer.go:754: [info] [query]ALTER TABLE dyaccount._user_extend_new ADD index idx_userpin(user_pin) [current pos](mysql-bin.000240, 113641935) [next pos](mysql-bin.000240, 113642133) [current gtid set] [next gtid set]