From 2ea617f6a3e32ddc5c35fafbb5ad6c86d8a3278c Mon Sep 17 00:00:00 2001
From: Yongting You <2010youy01@gmail.com>
Date: Tue, 21 Jul 2026 15:41:06 +0800
Subject: [PATCH] test: improve array_distance SQL coverage

---
 .../test_files/array/array_length.slt         | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/datafusion/sqllogictest/test_files/array/array_length.slt b/datafusion/sqllogictest/test_files/array/array_length.slt
index 1bb5382339854..50c70758ee03c 100644
--- a/datafusion/sqllogictest/test_files/array/array_length.slt
+++ b/datafusion/sqllogictest/test_files/array/array_length.slt
@@ -204,6 +204,52 @@ select list_distance([1, 2, 3], [1, 2, 3]) AS distance;
 ----
 0
 
+# array_distance with null outer arrays
+query RR
+select
+  array_distance(arrow_cast(NULL, 'List(Float64)'), [1, 2]),
+  array_distance([1, 2], arrow_cast(NULL, 'List(Float64)'));
+----
+NULL NULL
+
+# nested large-list inputs and nested nulls on either side
+query R
+select array_distance(
+  arrow_cast([[1, 2]], 'LargeList(LargeList(Float64))'),
+  arrow_cast([[1, 4]], 'LargeList(LargeList(Float64))')
+);
+----
+2
+
+query RR
+select
+  array_distance(
+    arrow_cast([[1, NULL]], 'LargeList(LargeList(Float64))'),
+    arrow_cast([[1, 2]], 'LargeList(LargeList(Float64))')
+  ),
+  array_distance(
+    arrow_cast([[1, 2]], 'LargeList(LargeList(Float64))'),
+    arrow_cast([[1, NULL]], 'LargeList(LargeList(Float64))')
+  );
+----
+NULL NULL
+
+# invalid argument count and types
+query error DataFusion error:
+select array_distance();
+
+query error DataFusion error:
+select array_distance([1]);
+
+query error DataFusion error:
+select array_distance([1], [2], [3]);
+
+query error array_distance does not support type Int64
+select array_distance(1, [1]);
+
+query error array_distance does not support types
+select array_distance([1], arrow_cast([1], 'LargeList(Float64)'));
+
 # array_distance with columns
 query RRR
 select array_distance(column1, column2), array_distance(column1, column3), array_distance(column1, column4) from arrays_distance_table;