presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/file/FileHiveMetastore.java/FileHiveMetastore/readSchemaFile
class FileHiveMetastore:    private <T> Optional<T> readSchemaFile(String type, Path metadataDirectory, JsonCodec<T> codec)
    {
        Path schemaPath = new Path(metadataDirectory, PRESTO_SCHEMA_FILE_NAME);
        return readFile(type + " schema", schemaPath, codec);
    }