Wes McKinney created ARROW-6869:
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Summary: [C++] Dictionary "delta" building logic in builder_dict.h
produces invalid arrays
Key: ARROW-6869
URL: https://issues.apache.org/jira/browse/ARROW-6869
Project: Apache Arrow
Issue Type: Bug
Components: C++
Reporter: Wes McKinney
Fix For: 1.0.0
Looking at the unit tests for the dictionary delta logic -- the arrays that are
produced by subsequent invocations of {{Finish}} yield DictionaryArray
instances with partial dictionaries. I think this is misleading (I was
surprised to find this while working on ARROW-6861). We should develop a
different approach to computing dictionary delta.
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