presto-iceberg/src/main/java/io/prestosql/plugin/iceberg/HiveTableOperations.java/HiveTableOperations/refresh
class HiveTableOperations:    @Override
    public TableMetadata refresh()
    {
        if (location.isPresent()) {
            refreshFromMetadataLocation(null);
            return currentMetadata;
        }

        Table table = getTable();

        if (!isIcebergTable(table)) {
            throw new UnknownTableTypeException(getSchemaTableName());
        }

        String metadataLocation = table.getParameters().get(METADATA_LOCATION);
        if (metadataLocation == null) {
            throw new PrestoException(ICEBERG_INVALID_METADATA, format("Table is missing [%s] property: %s", METADATA_LOCATION, getSchemaTableName()));
        }

        refreshFromMetadataLocation(metadataLocation);

        return currentMetadata;
    }