Method apply_operator

datafusion/expr-common/src/interval_arithmetic.rs:2112–2163

Apply the given operator to this interval and the given interval. # Examples ``` use datafusion_common::ScalarValue; use datafusion_expr_common::interval_arithmetic::Interval; use datafusion_expr_common::interval_arithmetic::NullableInterval; use datafusion_expr_common::operator::Operator; // 4 > 3 -> true let lhs = NullableInterval::from(ScalarValue::Int32(Some(4))); let rhs = NullableInterval

(&self, op: &Operator, rhs: &Self)

    /// );
    /// ```
    pub fn apply_operator(&self, op: &Operator, rhs: &Self) -> Result<Self> {
        match op {
            Operator::IsDistinctFrom => {
                let values = match (self, rhs) {
                    // NULL is distinct from NULL -> False
                    (Self::Null { .. }, Self::Null { .. }) => Interval::FALSE,
                    // x is distinct from y -> x != y,
                    // if at least one of them is never null.
                    (Self::NotNull { .. }, _) | (_, Self::NotNull { .. }) => {
                        let lhs_values = self.values();
                        let rhs_values = rhs.values();
                        match (lhs_values, rhs_values) {
                            (Some(lhs_values), Some(rhs_values)) => {
                                lhs_values.equal(rhs_values)?.not()?
                            }
                            (Some(_), None) | (None, Some(_)) => Interval::TRUE,
                            (None, None) => unreachable!("Null case handled above"),
                        }
                    }
                    _ => Interval::TRUE_OR_FALSE,
                };
                // IsDistinctFrom never returns null.
                Ok(Self::NotNull { values })
            }
            Operator::IsNotDistinctFrom => self
                .apply_operator(&Operator::IsDistinctFrom, rhs)
                .map(|i| i.not())?,
            Operator::And => self.and(rhs),
            Operator::Or => self.or(rhs),
            _ => {
                if let (Some(left_values), Some(right_values)) =
                    (self.values(), rhs.values())
                {
                    let values = apply_operator(op, left_values, right_values)?;
                    match (self, rhs) {
                        (Self::NotNull { .. }, Self::NotNull { .. }) => {
                            Ok(Self::NotNull { values })
                        }
                        _ => Ok(Self::MaybeNull { values }),
                    }
                } else if op.supports_propagation() {
                    Ok(Self::Null {
                        datatype: DataType::Boolean,
                    })
                } else {
                    Ok(Self::Null {
                        datatype: self.data_type(),
                    })
                }
            }
        }
    }

    /// Decide if this interval is a superset of, overlaps with, or
    /// disjoint with `other` by returning `[true, true]`, `[false, true]` or