From 9ed6aba422068514413bea39a1c255d1adae458f Mon Sep 17 00:00:00 2001
From: Guillaume Balaine <igosuki.github@gmail.com>
Date: Wed, 5 Jan 2022 18:55:30 +0100
Subject: [PATCH] arrays can be null and should be unboxed when deserializing
 items (#727)

---
 src/io/avro/read/deserialize.rs | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/io/avro/read/deserialize.rs b/src/io/avro/read/deserialize.rs
index f3b37ec1546..fae7c148bd9 100644
--- a/src/io/avro/read/deserialize.rs
+++ b/src/io/avro/read/deserialize.rs
@@ -96,10 +96,15 @@ fn deserialize_value<'a>(
     let data_type = array.data_type();
     match data_type {
         DataType::List(inner) => {
-            let avro_inner = if let AvroSchema::Array(inner) = avro_field {
-                inner.as_ref()
-            } else {
-                unreachable!()
+            let avro_inner = match avro_field {
+                AvroSchema::Array(inner) => inner.as_ref(),
+                AvroSchema::Union(u) => match &u.as_slice() {
+                    &[AvroSchema::Array(inner), _] | &[_, AvroSchema::Array(inner)] => {
+                        inner.as_ref()
+                    }
+                    _ => unreachable!(),
+                },
+                _ => unreachable!(),
             };
 
             let is_nullable = inner.is_nullable();