presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/PushDeleteIntoConnector.java/PushDeleteIntoConnector/PushDeleteIntoConnector
class PushDeleteIntoConnector:    public PushDeleteIntoConnector(Metadata metadata)
    {
        this.metadata = requireNonNull(metadata, "metadata is null");
    }