You're right about 5 impalad nodes. With 10 nodes, insert operations make 10 parquet files and file sizes reduce to 50% ? Any method to merge files into one?
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Similar problem, unsolved ! Create an unpartitioned table stored as parquet, then insert overwrite the table with select from an old partitioned table. The new unpartitioned table contained 5 .parq files ( size in 70~80kb). Why?
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