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Sutou Kouhei authored and GitHub committed 8d6b17a8c71
GH-21430: [GLib] GArrowSparseUnionArrayBuilder (#34992) ### Rationale for this change It's a missing binding. ### What changes are included in this PR? Add `arrow::SparseUnionBuilder` binding and related features. ### Are these changes tested? Yes. ### Are there any user-facing changes? Yes. * Closes: #21430 Authored-by: Sutou Kouhei <kou@clear-code.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>