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      reverse is useful function for procession String.

      for example:

      select reverse("abcd") // return "dcba"
      

      It is supported as a UDF in Hive, more details please see[1] [1]https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-StringFunctions

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              guibopan Guibo Pan
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