Function get_exprs_except_skipped

datafusion/expr/src/utils.rs:388–407

Returns all `Expr`s in the schema, except the `Column`s in the `columns_to_skip`

(
    schema: &DFSchema,
    columns_to_skip: &HashSet<Column>,
)

/// Returns all `Expr`s in the schema, except the `Column`s in the `columns_to_skip`
fn get_exprs_except_skipped(
    schema: &DFSchema,
    columns_to_skip: &HashSet<Column>,
) -> Vec<Expr> {
    if columns_to_skip.is_empty() {
        schema.iter().map(Expr::from).collect::<Vec<Expr>>()
    } else {
        schema
            .columns()
            .iter()
            .filter_map(|c| {
                if !columns_to_skip.contains(c) {
                    Some(Expr::Column(c.clone()))
                } else {
                    None
                }
            })
            .collect::<Vec<Expr>>()
    }
}

/// When a JOIN has a USING clause, the join columns appear in the output
/// schema once per side (for inner/outer joins) or once total (for semi/anti