Function tsquery_join 

pub fn tsquery_join(
    op: u8,
    distance: u16,
    left: &[QueryItem],
    right: &[QueryItem],
) -> Result<Vec<QueryItem>, TypeError>

join_tsqueries and QTN2QT: the query left op right, or !right for TSQUERY_NOT with an empty left.

Errors

54000 when the lexemes are too long for one query, and 54001 for a query that is too deep.