Re: [PR] Add example for `ScalarStructBuilder::new_null`, fix display for `null` `ScalarValue::Struct` [arrow-datafusion]

["viirya (via GitHub)" <gi...@apache.org>]

viirya commented on code in PR #9238:
URL: https://github.com/apache/arrow-datafusion/pull/9238#discussion_r1491326276


##########
datafusion/common/src/scalar/struct_builder.rs:
##########
@@ -39,8 +39,40 @@ impl ScalarStructBuilder {
         Self::default()
     }
 
-    /// Return a new [`ScalarValue::Struct`] with the specified fields and a
-    /// single null value
+    /// Return a new [`ScalarValue::Struct`] with a single `null` value.
+    ///
+    /// Note this is different from a struct where each of the specified fields
+    /// are null (e.g. `{a: NULL}`)
+    ///

Review Comment:
   👍 



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