presto-main/src/main/java/io/prestosql/connector/system/SystemTablesMetadata.java/SystemTablesMetadata/getTableHandle
class SystemTablesMetadata:    @Override
    public ConnectorTableHandle getTableHandle(ConnectorSession session, SchemaTableName tableName)
    {
        Optional<SystemTable> table = tables.getSystemTable(session, tableName);
        if (!table.isPresent()) {
            return null;
        }
        return SystemTableHandle.fromSchemaTableName(tableName);
    }