class TableColumnCommentCustomizer implements TableMetadataCustomizer {

    @Override
    public void customColumn(Class<?> entityType,
                             PropertyDescriptor descriptor,
                             Field field,
                             Set<Annotation> annotations,
                             RDBColumnMetadata column) {
        if (StringUtils.isEmpty(column.getComment())) {
            annotations
                .stream()
                .filter(Schema.class::isInstance)
                .map(Schema.class::cast)
                .findAny()
                .ifPresent(schema -> column.setComment(schema.description()));
        }
    }

    @Override
    public void customTable(Class<?> entityType, RDBTableMetadata table) {<FILL_FUNCTION_BODY>}
}

        Schema schema = entityType.getAnnotation(Schema.class);
        if (null != schema) {
            table.setComment(schema.description());
        }
    
<no_super_class>