code: @Support({SQLDialect.POSTGRES})
      public static Field<String> stringAgg(Field<String> field, String delimiter) {
          return DSL.field("string_agg({0}, {1})", field.getDataType(), field, DSL.val(delimiter));
      }
docs: Joins a set of string values using the given delimiter.
  
  @param field the field to be concatenated
  @param delimiter the separating delimiter
  @return a {@link Field} representing the joined string