alamb commented on code in PR #3810:
URL: https://github.com/apache/arrow-datafusion/pull/3810#discussion_r996289143


##########
datafusion/optimizer/src/utils.rs:
##########
@@ -424,31 +468,74 @@ mod tests {
     use super::*;
     use arrow::datatypes::DataType;
     use datafusion_common::Column;
-    use datafusion_expr::{binary_expr, col, lit, utils::expr_to_columns};
+    use datafusion_expr::{col, lit, utils::expr_to_columns};
     use std::collections::HashSet;
     use std::ops::Add;
 
     #[test]
-    fn combine_zero_filters() {
-        let result = combine_filters(&[]);
-        assert_eq!(result, None);
+    fn test_split_conjunction() {

Review Comment:
   This was a great idea @jackwener  -- thank you. I added this test  09f3cf4e4
   
   As part of writing tests, I also found that the API for `disjunction` was 
slightly different than `conjunction` so I made them the same as well. 



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