Will Jones created ARROW-17923:
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Summary: [C++] Consider dictionary arrays for special fragment
fields
Key: ARROW-17923
URL: https://issues.apache.org/jira/browse/ARROW-17923
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Will Jones
I noticed in ARROW-15281 we made {{__filename}} a string column. In common
cases, this will be inefficient if materialized. If possible, it may be better
to have them be dictionary arrays.
As an example,
[here|https://github.com/apache/arrow/pull/12826#issuecomment-1230745059] is a
user report of 10x increased memory usage caused by accidentally including
these special fragment columns.
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