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when i exec 'insert overwrite' in hive,the old data dir not deleted

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Everytime I exec 'insert overwrite ...' in hive of hdp3.0.0, old data dir base_000000x is not deleted,new data is saved to a new base_00000xx dir。I don't want to retain the old data。 I having a table size is 2G,but now,For this reason,it increased to 2T.

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