parse_subexpr doesn't handle alias

[Eason0729]

It seems like parse_subexpr doesn't handle alias.

Here is some example:

1 + 3 * col0 as new_col0

It returns...

BinaryOp { left: Value(Number("1", false)), op: Plus, right: BinaryOp { left: Value(Number("3", false)), op: Multiply, right: Identifier(Ident { value: "col0", quote_style: None }) } }

I would like to work on this, but I have almost no experience writing parser, would probably need some help.

[Eason0729]

Sorry for filling bad issue, I think maybe using parse_identifier_with_alias would be the correct way to do handle alias

[Eason0729]

I think parse_subexpr is not responsible for handling alias, and making parse_expr_with_alias public should serve the purpose.