[bug] execute sql but parse error

[Toms1999]

Before you file an issue

• Make sure you specify the "read" dialect eg. parse_one(sql, read="spark")
• Make sure you specify the "write" dialect eg. ast.sql(dialect="duckdb")
• Check if the issue still exists on main

Fully reproducible code snippet
Please include a fully reproducible code snippet or the input sql, dialect, and expected output.

Official Documentation
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[Toms1999]

this is sql:
error:
select unnest from aaa;

true:
select "unnest" from aaa;