Function unnormalize_col

datafusion/expr/src/expr_rewriter/mod.rs:161–174

Recursively 'unnormalize' (remove all qualifiers) from an expression tree. For example, if there were expressions like `foo.bar` this would rewrite it to just `bar`.

(expr: Expr)

/// For example, if there were expressions like `foo.bar` this would
/// rewrite it to just `bar`.
pub fn unnormalize_col(expr: Expr) -> Expr {
    expr.transform(|expr| {
        Ok({
            if let Expr::Column(c) = expr {
                let col = Column::new_unqualified(c.name);
                Transformed::yes(Expr::Column(col))
            } else {
                Transformed::no(expr)
            }
        })
    })
    .data()
    .expect("Unnormalize is infallible")
}

/// Create a Column from the Scalar Expr
pub fn create_col_from_scalar_expr(