Method nulls_first

datafusion/sql/src/planner.rs:186–193

Evaluates the null ordering based on the given ascending flag. # Returns `true` if nulls should appear first. `false` if nulls should appear last.

(&self, asc: bool)

    /// * `true` if nulls should appear first.
    /// * `false` if nulls should appear last.
    pub fn nulls_first(&self, asc: bool) -> bool {
        match self {
            Self::NullsMax => !asc,
            Self::NullsMin => asc,
            Self::NullsFirst => true,
            Self::NullsLast => false,
        }
    }
}

impl FromStr for NullOrdering {