presto-main/src/main/java/io/prestosql/index/IndexManager.java/IndexManager/getIndex
class IndexManager:    public ConnectorIndex getIndex(Session session, IndexHandle indexHandle, List<ColumnHandle> lookupSchema, List<ColumnHandle> outputSchema)
    {
        ConnectorSession connectorSession = session.toConnectorSession(indexHandle.getCatalogName());
        ConnectorIndexProvider provider = getProvider(indexHandle);
        return provider.getIndex(indexHandle.getTransactionHandle(), connectorSession, indexHandle.getConnectorHandle(), lookupSchema, outputSchema);
    }