[ARROW-9150] Support Dictionary Unification with Concatenate

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Duplicate
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/17230
• Assignee: Unassigned
• Reporter: Daniel Nugent
• Created: 16/Jun/20 19:04
• Updated: 11/Jan/23 08:04
• Resolved: 17/Jun/20 14:09

Description

Seems to be supported through arrow to pandas conversions at the moment. I believe the DictionaryUnifier could be leveraged for this.

Not sure if there are unintended consequences, but the NYI implies that this is desired. Didn't see an open issue for it already.

Issue Links

• duplicates: ARROW-5336 [C++] Implement arrow::Concatenate for dictionary-encoded arrays with unequal dictionaries