presto-spi/src/main/java/io/prestosql/spi/connector/classloader/ClassLoaderSafeConnectorPageSink.java/ClassLoaderSafeConnectorPageSink/finish
class ClassLoaderSafeConnectorPageSink:    @Override
    public CompletableFuture<Collection<Slice>> finish()
    {
        try (ThreadContextClassLoader ignored = new ThreadContextClassLoader(classLoader)) {
            return delegate.finish();
        }
    }