Wes McKinney created ARROW-3325:
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Summary: [Python] Support reading Parquet binary/string columns as
pandas Categorical
Key: ARROW-3325
URL: https://issues.apache.org/jira/browse/ARROW-3325
Project: Apache Arrow
Issue Type: Improvement
Components: Python
Reporter: Wes McKinney
Fix For: 0.12.0
Requires PARQUET-1324 and probably quite a bit of extra work
Properly implementing this will require dictionary normalization across row
groups. When reading a new row group, a fast path that compares the current
dictionary with the prior dictionary should be used. This also needs to handle
the case where a column chunk "fell back" to PLAIN encoding mid-stream
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