presto-parser/src/main/java/io/prestosql/sql/tree/ShowSession.java/ShowSession/ShowSession
class ShowSession:    private ShowSession(Optional<NodeLocation> location, Optional<String> likePattern, Optional<String> escape)
    {
        super(location);
        this.likePattern = requireNonNull(likePattern, "likePattern is null");
        this.escape = requireNonNull(escape, "escape is null");
    }