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[Format][Documentation] add discussion of Union.typeIds to Layout.rst #22342
Description
Union.typeIds is poorly documented and the corresponding property in UnionType is confusingly named type_codes. In particular, Layout.rst doesn't include an explanation of Union.typeIds and implies that an element of a union array's type_ids buffer is always the index of a child array.
Reporter: Ben Kietzman / @bkietz
Note: This issue was originally created as ARROW-5933. Please see the migration documentation for further details.
Activity
asfimport commentedon Jul 12, 2022
Todd Farmer / @toddfarmer:
This issue was last updated over 90 days ago, which may be an indication it is no longer being actively worked. To better reflect the current state, the issue is being unassigned. Please feel free to re-take assignment of the issue if it is being actively worked, or if you plan to start that work soon.
apacheGH-22342: [C++] [Documentation] Wrap Union type id text
GH-22342: [Format][Documentation] Clarify Union type ids (#50839)
pitrou commentedon Oct 6, 2026
Issue resolved by pull request 50839
#50839
[-][C++] [Documentation] add discussion of Union.typeIds to Layout.rst [/-][+][Format][Documentation] add discussion of Union.typeIds to Layout.rst [/+]pitrou commentedon Oct 6, 2026
@erichanwang Can you post here so that we can assign this issue to you?