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Posted to github@arrow.apache.org by "llama90 (via GitHub)" <gi...@apache.org> on 2023/12/04 13:02:29 UTC

Re: [I] [C++] Add Compute Kernel for Casting from String to Dictionary [arrow]

llama90 commented on issue #39049:
URL: https://github.com/apache/arrow/issues/39049#issuecomment-1838591714

   ### Progress Update
   
   #### What is the casting from String to Dictionary?
   
   https://github.com/apache/arrow/blob/f7947cc21bf78d67cf5ac1bf1894b5e04de1a632/cpp/src/arrow/scalar_test.cc#L1468-L1498
   
   When printing casted value (`cast_alpha->ToString()`)
   
   * "alpha" -> [ "alpha" ][0]
   * null -> null
   * "gamma" -> [ "gamma" ][0]
   
   #### Legacy `CastTo` logic
   
   https://github.com/apache/arrow/blob/f7947cc21bf78d67cf5ac1bf1894b5e04de1a632/cpp/src/arrow/scalar.cc#L1264-L1269
   
   


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