orql 0.1.0

A toy SQL parser for a subset of the Oracle dialect.
Documentation 
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/// The different type so duplicates filtering, e.g. `DISTINCT`, `UNIQUE`, `ALL`.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Duplicates {
    /// `SELECT ALL ...`
    ///
    /// No filtering at all, passing through ALL entries / rows.
    All,

    /// `SELECT DISTINCT ...`
    ///
    /// Filtering for uniques, passing through only DISTINCT entries / rows.
    Distinct,

    /// `SELECT UNIQUE ...`
    ///
    /// Equivalent to [Self::Distinct].
    Unique,
}

impl Duplicates {
    /// Determines if this filter denotes filtering for distinct entries.
    pub fn is_distinct(&self) -> bool {
        matches!(self, Duplicates::Distinct | Duplicates::Unique)
    }
}