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Wes McKinney
6f2c9041137
Wes McKinney authored 83ed357d726
ARROW-6861: [C++] Fix length/null_count/capacity accounting through Reset and AppendIndices in DictionaryBuilder

Some more work is needed in ARROW-6869 to move the memo table resetting logic out of `DictionaryBuilder::Reset` but we can leave that for 1.0.0 work

Closes #5643 from wesm/ARROW-6861 and squashes the following commits:

9a197735e <Wes McKinney> Test using dictionary builder again after finish
890a6dc9e <Wes McKinney> Simpler fix for ARROW-6861

Authored-by: Wes McKinney <wesm+git@apache.org>
Signed-off-by: Wes McKinney <wesm+git@apache.org>