presto-main/src/main/java/io/prestosql/metadata/HandleResolver.java/HandleResolver/addCatalogHandleResolver
class HandleResolver:    public void addCatalogHandleResolver(String catalogName, ConnectorHandleResolver resolver)
    {
        requireNonNull(catalogName, "catalogName is null");
        requireNonNull(resolver, "resolver is null");
        MaterializedHandleResolver existingResolver = handleResolvers.putIfAbsent(catalogName, new MaterializedHandleResolver(resolver));
        checkState(existingResolver == null, "Catalog '%s' is already assigned to resolver: %s", catalogName, existingResolver);
    }