[GitHub] [arrow-datafusion] isidentical commented on a diff in pull request #3804: Optimize `regexp_replace` when the input is a sparse array

[GitBox <gi...@apache.org>]

isidentical commented on code in PR #3804:
URL: https://github.com/apache/arrow-datafusion/pull/3804#discussion_r993804566


##########
datafusion/physical-expr/src/regex_expressions.rs:
##########
@@ -513,4 +539,40 @@ mod tests {
             }
         }
     }
+
+    #[test]
+    fn test_static_pattern_regexp_replace_with_null_buffers() {
+        let values = StringArray::from(vec![
+            Some("a"),
+            None,
+            Some("b"),
+            None,
+            Some("a"),
+            None,
+            None,
+            Some("c"),
+        ]);
+        let patterns = StringArray::from(vec!["a"; 1]);
+        let replacements = StringArray::from(vec!["foo"; 1]);
+        let expected = StringArray::from(vec![
+            Some("foo"),
+            None,
+            Some("b"),
+            None,
+            Some("foo"),
+            None,
+            None,
+            Some("c"),
+        ]);
+
+        let re = _regexp_replace_static_pattern_replace::<i32>(&[
+            Arc::new(values),
+            Arc::new(patterns),
+            Arc::new(replacements),
+        ])
+        .unwrap();
+
+        assert_eq!(re.as_ref(), &expected);
+        assert_eq!(re.null_count(), 4);

Review Comment:
   Great catch, and thanks for the suggestion @alamb! Should be added now.



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