presto-main/src/main/java/io/prestosql/split/PageSinkManager.java/PageSinkManager/addConnectorPageSinkProvider
class PageSinkManager:    public void addConnectorPageSinkProvider(CatalogName catalogName, ConnectorPageSinkProvider pageSinkProvider)
    {
        requireNonNull(catalogName, "catalogName is null");
        requireNonNull(pageSinkProvider, "pageSinkProvider is null");
        checkState(pageSinkProviders.put(catalogName, pageSinkProvider) == null, "PageSinkProvider for connector '%s' is already registered", catalogName);
    }