From ccc8a4c569098795f54a8ec1bedf35891c9c372c Mon Sep 17 00:00:00 2001
From: Ben Chambers <bjchambers@users.noreply.github.com>
Date: Wed, 30 Jun 2021 09:25:13 -0700
Subject: [PATCH] failing test

---
 arrow/src/array/equal/mod.rs | 67 +++++++++++++++++++++++++++++++++++-
 1 file changed, 66 insertions(+), 1 deletion(-)

diff --git a/arrow/src/array/equal/mod.rs b/arrow/src/array/equal/mod.rs
index 3c752284dd0..bc5df9a80ac 100644
--- a/arrow/src/array/equal/mod.rs
+++ b/arrow/src/array/equal/mod.rs
@@ -295,7 +295,7 @@ mod tests {
         Int32Builder, ListBuilder, NullArray, PrimitiveBuilder, StringArray,
         StringDictionaryBuilder, StringOffsetSizeTrait, StructArray,
     };
-    use crate::array::{GenericStringArray, Int32Array};
+    use crate::array::{GenericStringArray, Int32Array, StringBuilder, StructBuilder};
     use crate::buffer::Buffer;
     use crate::datatypes::{Field, Int16Type, ToByteSlice};
 
@@ -1019,6 +1019,71 @@ mod tests {
         test_equal(&a, &b, true);
     }
 
+    fn make_struct(
+        elements: Vec<Option<(Option<&'static str>, Option<i32>)>>,
+    ) -> StructArray {
+        let mut builder = StructBuilder::new(
+            vec![
+                Field::new("f1", DataType::Utf8, true),
+                Field::new("f2", DataType::Int32, true),
+            ],
+            vec![
+                Box::new(StringBuilder::new(elements.len())),
+                Box::new(Int32Builder::new(elements.len())),
+            ],
+        );
+
+        for element in elements {
+            match element.and_then(|e| e.0) {
+                None => builder
+                    .field_builder::<StringBuilder>(0)
+                    .unwrap()
+                    .append_null()
+                    .unwrap(),
+                Some(s) => builder
+                    .field_builder::<StringBuilder>(0)
+                    .unwrap()
+                    .append_value(s)
+                    .unwrap(),
+            };
+
+            builder
+                .field_builder::<Int32Builder>(1)
+                .unwrap()
+                .append_option(element.and_then(|e| e.1))
+                .unwrap();
+
+            builder.append(element.is_some()).unwrap();
+        }
+
+        builder.finish()
+    }
+
+    #[test]
+    fn test_struct_equal_slice() {
+        let a = make_struct(vec![
+            None,
+            Some((Some("joe"), Some(1))),
+            Some((None, Some(2))),
+            Some((None, None)),
+            Some((Some("mark"), Some(4))),
+            Some((Some("doe"), Some(5))),
+        ]);
+        let a = a.slice(1, 5);
+        let a = a.as_any().downcast_ref::<StructArray>().unwrap();
+
+        let b = make_struct(vec![
+            Some((Some("joe"), Some(1))),
+            Some((None, Some(2))),
+            Some((None, None)),
+            Some((Some("mark"), Some(4))),
+            Some((Some("doe"), Some(5))),
+        ]);
+        assert_eq!(a, &b);
+
+        test_equal(a.data(), b.data(), true);
+    }
+
     #[test]
     fn test_struct_equal_null() {
         let strings: ArrayRef = Arc::new(StringArray::from(vec![