Distinct on expressions mismatch ORDER BY expressions because of a qualified column

[epsio-banay]

Describe the bug

When planning a query with distinct on, the distinct on expressions must match the order by expressions.
There is a check for that, however the check checks if the expressions are equal without normalizing column names first.
Because of that planning queries like "SELECT DISTINCT ON (t.a) * FROM t ORDER BY a" won't work while ""SELECT DISTINCT ON (t.a) * FROM t ORDER BY t.a" will.

To Reproduce

Add the following to plan.rs unit tests and run:

#[test]
    fn distinct_on_expr_order_by_match() -> Result<()> {
        let schema = Schema::new(vec![Field::new("a", DataType::Int32, false)]);

        let table_scan =
            table_scan(Some(TableReference::bare("t")), &schema, None)?.build()?;
        let p = DistinctOn::try_new(
            vec![col("a")],
            vec![],
            Some(vec![SortExpr::new(col("t.a"), true, false)]),
            Arc::new(table_scan),
        )?;
        Ok(())
    }

Expected behavior

Test should pass

Additional context

No response