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  1. Apache Arrow
  2. ARROW-971

[C++/Python] Implement Array.isvalid/notnull/isnull as scalar functions

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      For arrays with nulls, this amounts to returning the validity bitmap. Without nulls, an array of all 1 bits must be constructed. For isnull, the bits must be flipped (in this case, the un-set part of the new bitmap must stay 0, though).

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              bkietz Ben Kietzman
              wesm Wes McKinney
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