From e1ac27767ca2139f682a1b0cc08a221010bb4daf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BC=A0=E6=9E=97=E4=BC=9F?= <lewiszlw520@gmail.com>
Date: Tue, 11 Mar 2025 18:23:20 +0800
Subject: [PATCH] Expose `field_builders` in `StructBuilder` (#7217)

* Expose field_builders in StructBuilder

* Add field_builders_mut
---
 arrow-array/src/builder/struct_builder.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arrow-array/src/builder/struct_builder.rs b/arrow-array/src/builder/struct_builder.rs
index 5cebc6485e0c..4379a7d0cfeb 100644
--- a/arrow-array/src/builder/struct_builder.rs
+++ b/arrow-array/src/builder/struct_builder.rs
@@ -372,6 +372,16 @@ impl StructBuilder {
         self.field_builders[i].as_any_mut().downcast_mut::<T>()
     }
 
+    /// Returns a reference to field builders
+    pub fn field_builders(&self) -> &[Box<dyn ArrayBuilder>] {
+        &self.field_builders
+    }
+
+    /// Returns a mutable reference to field builders
+    pub fn field_builders_mut(&mut self) -> &mut [Box<dyn ArrayBuilder>] {
+        &mut self.field_builders
+    }
+
     /// Returns the number of fields for the struct this builder is building.
     pub fn num_fields(&self) -> usize {
         self.field_builders.len()