presto-thrift-api/src/main/java/io/prestosql/plugin/thrift/api/PrestoThriftNullableTableMetadata.java/PrestoThriftNullableTableMetadata/getTableMetadata
class PrestoThriftNullableTableMetadata:    @Nullable
    @ThriftField(value = 1, requiredness = OPTIONAL)
    public PrestoThriftTableMetadata getTableMetadata()
    {
        return tableMetadata;
    }