Function datafusion_expr::expr_fn::ident

pub fn ident(name: impl Into<String>) -> Expr

Create an unqualified column expression from the provided name, without normalizing the column.

For example:

let c1 = ident("A"); // not normalized staying as column 'A'
let c2 = col("A"); // normalized via SQL rules becoming column 'a'
assert_ne!(c1, c2);

let c3 = col(r#""A""#);
assert_eq!(c1, c3);

let c4 = col("t1.a"); // parses as relation 't1' column 'a'
let c5 = ident("t1.a"); // parses as column 't1.a'
assert_ne!(c4, c5);