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How to preprocess data before loading in BI tools ?

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How to preprocess data before loading in BI tools ?

New Contributor

Hi, I currently store raw data without any process in HDFS as well as Hive,

now I want to use BI tool to visualize and analyze, processed data, through to Druid or Hive,

so plz show me how can I transform or clean..., and how to use script to automate this process,..

Thank you so much.