arrow-ipc: Add tests for nested dicts for Map and Union arrays #9146
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Jefffrey
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Jan 12, 2026
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Which issue does this PR close?
No known issue, but this confirms that nested dicts do indeed work in Map and Union arrays. It was brought up here: #9126 (comment)
Rationale for this change
Ensure that IPC roundtripping nested dicts works in Map and Union arrays.
What changes are included in this PR?
Unit tests testing the functionality.
Are these changes tested?
The whole PR consists of tests only.
Are there any user-facing changes?
No
@alamb @Jefffrey