why there are two execution for one sql in SQL web ui?

[石鹏磊]

When i submit a sql such as `insert overwrite table table1 partition (sign_date='2020-12-28') select id,name from table1` with spark-sql shell, there are two execution displayed in SQL web ui，

one execution has a job, another one has no job, the physical plan like this:

why there is a LocalTableScan?