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Sanjiban SenguptaJoris Van den Bossche
7616fba56ef
Sanjiban Sengupta authored and Joris Van den Bossche committed 85809a95419
ARROW-16113: [Python] Partitioning.dictionaries in case of a subset of fields are dictionary encoded

This PR modifies the `dictionaries` method to have entries for all the fields. With this change, the method will return a list with the values if present, otherwise it shall contain `None`, thus returning a list of same length.

Ref: https://github.com/apache/arrow/pull/12530#discussion_r841886153

Closes #12791 from sanjibansg/partitioning_dictionaries

Authored-by: Sanjiban Sengupta <sanjiban.sg@gmail.com>
Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>