presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/systemtables/TableMetadataSystemTable.java/TableMetadataSystemTable/pageSource
class TableMetadataSystemTable:    @Override
    public ConnectorPageSource pageSource(ConnectorTransactionHandle transactionHandle, ConnectorSession session, TupleDomain<Integer> constraint)
    {
        return new FixedPageSource(buildPages(dao, tableMetadata, constraint));
    }