Can't parse valid Snowflake compound expression

[ramnes]

Hey there, thanks for the great project!

I'm encountering an issue with the following query, which is valid in Snowflake:

SELECT v.$2 FROM (VALUES (1, 'value1'), (2, 'value2')) AS v

It can't get parsed with sqlparser-rs:

Expected: an identifier or a '*' after '.', found: $2 at Line: 1, Column: 10

While this syntax isn't valid in PostgreSQL, it is accepted by Snowflake. SELECT $2 FROM ... (without the alias) parses correctly, so it seems the parser has trouble with positional parameters when they're part of compound expressions.

Is this a gap in the Snowflake dialect implementation?