[ARROW-6473] [Format] Clarify dictionary encoding edge cases

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.16.0
• Component/s: Documentation, Format
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/22842
• Assignee: Micah Kornfield
• Reporter: Micah Kornfield
• Created: 06/Sep/19 04:20
• Updated: 11/Jan/23 07:47
• Resolved: 02/Dec/19 01:23

Description

Several recent threads on the mailing list:

1.  Edge case for all null columns and interleaved dictionaries

2. Semantics non-delta dictionaries (and relation to the file format).

3.  Propose a forward compatible enum so dictionaries can represented as other types besides for a "flat" vector.

Issue Links

• links to: GitHub Pull Request #5585