presto-thrift-api/src/main/java/io/prestosql/plugin/thrift/api/PrestoThriftTableMetadata.java/PrestoThriftTableMetadata/getIndexableKeys
class PrestoThriftTableMetadata:    @Nullable
    @ThriftField(value = 4, requiredness = OPTIONAL)
    public List<Set<String>> getIndexableKeys()
    {
        return indexableKeys;
    }