Method select

datafusion/expr/src/logical_plan/builder.rs:615–621

Select the given column indices

(self, indices: impl IntoIterator<Item = usize>)

    /// Select the given column indices
    pub fn select(self, indices: impl IntoIterator<Item = usize>) -> Result<Self> {
        let exprs: Vec<_> = indices
            .into_iter()
            .map(|x| Expr::Column(Column::from(self.plan.schema().qualified_field(x))))
            .collect();
        self.project(exprs)
    }

    /// Apply a filter
    pub fn filter(self, expr: impl Into<Expr>) -> Result<Self> {