Method already_projected

datafusion/sql/src/unparser/ast.rs:249–251

Returns true if a projection has been explicitly set via `projection()`. This method is used to determine whether the SELECT clause has already been defined, which helps avoid creating duplicate projection nodes during query unparsing. It returns `true` for both empty and non-empty projections. # Returns - `true` if `projection()` has been called (regardless of whether it was empty or not) - `f

(&self)

    /// assert!(builder.already_projected()); // true for non-empty projection
    /// ```
    pub fn already_projected(&self) -> bool {
        self.projection.is_some()
    }
    pub fn into(&mut self, value: Option<ast::SelectInto>) -> &mut Self {
        self.into = value;
        self