presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/file/FileHiveMetastore.java/FileHiveMetastore/deleteTablePrivileges
class FileHiveMetastore:    private synchronized void deleteTablePrivileges(Table table)
    {
        try {
            Path permissionsDirectory = getPermissionsDirectory(table);
            metadataFileSystem.delete(permissionsDirectory, true);
        }
        catch (IOException e) {
            throw new PrestoException(HIVE_METASTORE_ERROR, "Could not delete table permissions", e);
        }
    }