public ColumnBuilder<T_ROW, T_COL> withNullValueSupplier(
                    final Supplier<String> nullValueSupplier) {

                this.nullValueSupplier = nullValueSupplier;
                return this;
            }
A column builder for when you need full control over the column style
stroom-util/src/main/java/stroom/util/logging/AsciiTable.java