Joris Van den Bossche created ARROW-8647: --------------------------------------------
Summary: [C++][Dataset] Optionally encode partition field values as dictionary type Key: ARROW-8647 URL: https://issues.apache.org/jira/browse/ARROW-8647 Project: Apache Arrow Issue Type: Improvement Components: C++ Reporter: Joris Van den Bossche Fix For: 1.0.0 In the Python ParquetDataset implementation, the partition fields are returned as dictionary type columns. In the new Dataset API, we now use a plain type (integer or string when inferred). But, you can already manually specify that the partition keys should be dictionary type by specifying the partitioning schema (in {{Partitioning}} passed to the dataset factory). Since using dictionary type can be more efficient (since partition keys will typically be repeated values in the resulting table), it might be good to still have an option in the DatasetFactory to use dictionary types for the partition fields. -- This message was sent by Atlassian Jira (v8.3.4#803005)