[bugfix](hive/iceberg)align with Hive insert overwrite table functionality (#39840) #40724
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…ality (apache#39840) ## Proposed changes When execute: `insert overwrite table tb1 select * from tb2` and `tb2` is an empty table: 1. if `tb1` is a partition table, there will be nothing to do. 2. if `tb1` is a unpartition table, the data in the table will be cleared.
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bp #39840