presto-thrift-api/src/main/java/io/prestosql/plugin/thrift/api/PrestoThriftColumnMetadata.java/PrestoThriftColumnMetadata/getComment
class PrestoThriftColumnMetadata:    @Nullable
    @ThriftField(value = 3, requiredness = OPTIONAL)
    public String getComment()
    {
        return comment;
    }