Function parse_union_except_op

graphlite/src/ast/parser.rs:894–929

Parse UNION or EXCEPT operation

(tokens: &[Token])

/// Parse UNION or EXCEPT operation
fn parse_union_except_op(tokens: &[Token]) -> IResult<&[Token], (SetOperationType, Query)> {
    alt((
        // UNION [ALL]
        map(
            tuple((
                expect_token(Token::Union),
                opt(expect_token(Token::All)),
                parse_intersect,
            )),
            |(_, all, right)| {
                let op = if all.is_some() {
                    SetOperationType::UnionAll
                } else {
                    SetOperationType::Union
                };
                (op, right)
            },
        ),
        // EXCEPT [ALL]
        map(
            tuple((
                expect_token(Token::Except),
                opt(expect_token(Token::All)),
                parse_intersect,
            )),
            |(_, all, right)| {
                let op = if all.is_some() {
                    SetOperationType::ExceptAll
                } else {
                    SetOperationType::Except
                };
                (op, right)
            },
        ),
    ))(tokens)
}

/// Parse INTERSECT operation
fn parse_intersect_op(tokens: &[Token]) -> IResult<&[Token], (SetOperationType, Query)> {