【详述】向表中添加列，任务一直卡在pending状态，通过show alter命令查看报错：table is unstable, unhealthy (or doing balance) tablet id 518478468，查看对应的tablet的状态也是normal，现在这个状态导致表无法添加字段，也无法执行delete操作。
【StarRocks版本】3.4.3-a01aa59
【集群规模】 3fe 7be
【附件】
查看tablet的信息并没有异常：
ReplicaId BackendId Version VersionHash LstSuccessVersion LstSuccessVersionHash LstFailedVersion LstFailedVersionHash LstFailedTime SchemaHash DataSize RowCount State IsBad IsSetBadForce VersionCount PathHash MetaUrl CompactionStatus IsErrorState
518478469 1031696 1 0 1 0 -1 0 -1 0 0 NORMAL false false 0 -1 http://*7:8040/api/meta/header/518478468 http://*7:8040/api/compaction/show?tablet_id=518478468&schema_hash=-1 false
518478470 1709247 1 0 1 0 -1 0 -1 0 0 NORMAL false false 0 -1 http://*8:8040/api/meta/header/518478468 http://*8:8040/api/compaction/show?tablet_id=518478468&schema_hash=-1 false
518478471 1710091 1 0 1 0 -1 0 -1 0 0 NORMAL false false 0 -1 http://*9:8040/api/meta/header/518478468 http://*9:8040/api/compaction/show?tablet_id=518478468&schema_hash=-1 false
也执行过repair操作没有效果。