Postgres: `DROP c` reformatted to `DROP COLUMN c`

[agis]

With v0.56.0 using the Postgres dialect, ALTER TABLE x DROP c is reformatted to ALTER TABLE x DROP COLUMN c.

use sqlparser::dialect::PostgreSqlDialect;
use sqlparser::parser::Parser;

fn main() {
    let sql = "ALTER TABLE foo DROP bar";
    let stmts = Parser::parse_sql(&PostgreSqlDialect {}, sql).unwrap();

    println!("{}", stmts[0]) // => "ALTER TABLE foo DROP COLUMN bar"
}

In Postgres, the COLUMN keyword is optional as per the official Postgres docs. According to sqlparser's README I would expect that the COLUMN keyword is not added:

This crate allows users to recover the original SQL text (with comments removed, normalized whitespace and keyword capitalization), which is useful for tools that analyze and manipulate SQL.

Would you classify this as a bug?