presto-tpch/src/main/java/io/prestosql/plugin/tpch/TpchMetadata.java/TpchMetadata/getTableHandle
class TpchMetadata:    @Override
    public TpchTableHandle getTableHandle(ConnectorSession session, SchemaTableName tableName)
    {
        requireNonNull(tableName, "tableName is null");
        if (!tableNames.contains(tableName.getTableName())) {
            return null;
        }

        // parse the scale factor
        double scaleFactor = schemaNameToScaleFactor(tableName.getSchemaName());
        if (scaleFactor <= 0) {
            return null;
        }

        return new TpchTableHandle(tableName.getTableName(), scaleFactor);
    }