public static String formatSortItems(List<SortItem> sortItems) {
    return sortItems.stream().map(sortItemFormatterFunction()).collect(joining(", "));
  }
Returns the formatted `LISTAGG` function call corresponding to the specified node.

<p>During the parsing of the syntax tree, the `LISTAGG` expression is synthetically converted
to a function call. This method formats the specified {@link FunctionCall} node to correspond
to the standardised syntax of the `LISTAGG` expression.

@param node the `LISTAGG` function call
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/sql/util/ExpressionFormatter.java