fix: address build failures with the newer kernel

crates/core/src/delta_datafusion/mod.rs

@@ -1767,7 +1767,6 @@ impl From<Column> for DeltaColumn {
 
 #[cfg(test)]
 mod tests {
-    use arrow::datatypes::DataType;
     use arrow_array::StructArray;
     use arrow_schema::Schema;
     use chrono::{TimeZone, Utc};

crates/core/src/kernel/scalars.rs

@@ -270,6 +270,7 @@ impl ScalarExt for Scalar {
             Self::Binary(val) => Value::String(create_escaped_binary_string(val.as_slice())),
             Self::Null(_) => Value::Null,
             Self::Struct(_) => unimplemented!(),
+            Self::Array(_) => unimplemented!(),
         }
     }
 }

crates/core/src/writer/stats.rs

@@ -613,7 +613,7 @@ mod tests {
                 Some($value),
                 Some($value),
                 None,
-                0,
+                Some(0),
                 false,
             ))
         };