public Column build() {
            return new Column(
                    id,
                    name,
                    expression,
                    sort,
                    filter,
                    format,
                    group,
                    width,
                    visible,
                    special,
                    columnFilter,
                    columnValueSelection);
        }
Set the group level

@param group The group level to apply to this field
@return The {@link Builder}, enabling method chaining
stroom-query/stroom-query-api/src/main/java/stroom/query/api/Column.java