chore

Author: Weijun-H

datafusion/expr/src/type_coercion/functions.rs

@@ -120,7 +120,6 @@ fn get_valid_types(
             DataType::List(ref field)
             | DataType::LargeList(ref field)
             | DataType::FixedSizeList(ref field, _) => {
-                // for the functions with signature 'array_element(array, int)'
                 let elem_type = if elem_base_type.eq(&DataType::Null) {
                     field.data_type()
                 } else {