Method precedence

datafusion/expr-common/src/operator.rs:298–337

Get the operator precedence use as a reference

(&self)

    /// Get the operator precedence
    /// use <https://www.postgresql.org/docs/7.2/sql-precedence.html> as a reference
    pub fn precedence(&self) -> u8 {
        match self {
            Operator::Or => 5,
            Operator::And => 10,
            Operator::Eq | Operator::NotEq | Operator::LtEq | Operator::GtEq => 15,
            Operator::Lt | Operator::Gt => 20,
            Operator::LikeMatch
            | Operator::NotLikeMatch
            | Operator::ILikeMatch
            | Operator::NotILikeMatch => 25,
            Operator::IsDistinctFrom
            | Operator::IsNotDistinctFrom
            | Operator::RegexMatch
            | Operator::RegexNotMatch
            | Operator::RegexIMatch
            | Operator::RegexNotIMatch
            | Operator::BitwiseAnd
            | Operator::BitwiseOr
            | Operator::BitwiseShiftLeft
            | Operator::BitwiseShiftRight
            | Operator::BitwiseXor
            | Operator::StringConcat
            | Operator::AtArrow
            | Operator::ArrowAt
            | Operator::Arrow
            | Operator::LongArrow
            | Operator::HashArrow
            | Operator::HashLongArrow
            | Operator::AtAt
            | Operator::IntegerDivide
            | Operator::HashMinus
            | Operator::AtQuestion
            | Operator::Question
            | Operator::QuestionAnd
            | Operator::QuestionPipe
            | Operator::Colon => 30,
            Operator::Plus | Operator::Minus => 40,
            Operator::Multiply | Operator::Divide | Operator::Modulo => 45,
        }
    }

    /// Returns true if the `Expr::BinaryOperator` with this operator
    /// is guaranteed to return null if either side is null.