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  1. Apache Arrow
  2. ARROW-7064

[R] Implement null type

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      I tried to read a Parquet file into an R data.frame, and there was a null column in it.

      Error in Table__to_dataframe(x, use_threads = option_use_threads()) : 
        cannot handle Array of type null
      

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              romainfrancois Romain Francois
              npr Neal Richardson
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