presto-memory/src/main/java/io/prestosql/plugin/memory/MemoryMetadata.java/MemoryMetadata/dropView
class MemoryMetadata:    @Override
    public synchronized void dropView(ConnectorSession session, SchemaTableName viewName)
    {
        if (views.remove(viewName) == null) {
            throw new ViewNotFoundException(viewName);
        }
    }