presto-thrift/src/main/java/io/prestosql/plugin/thrift/ThriftConnectorIndex.java/ThriftConnectorIndex/toString
class ThriftConnectorIndex:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("indexHandle", indexHandle)
                .add("lookupColumns", lookupColumns)
                .add("outputColumns", outputColumns)
                .toString();
    }