User defined functions with keyword or built in function names throw ParseError for BigQuery dialect

[relud]

observed on both version 11.7.1 and commit e7111ba6afdb67ae7be52cf39384d7bcb86a8dac

Fully reproducible code snippet

sqlglot.parse_one("CREATE FUNCTION mydataset.extract(x ANY TYPE) AS (x); SELECT dataset.extract(1) AS y", read="bigquery")

traceback:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.10/site-packages/sqlglot/__init__.py", line 150, in parse_one
    result = dialect.parse(sql, **opts)
  File "/usr/local/lib/python3.10/site-packages/sqlglot/dialects/dialect.py", line 163, in parse
    return self.parser(**opts).parse(self.tokenize(sql), sql)
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 836, in parse
    return self._parse(
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 899, in _parse
    expressions.append(parse_method(self))
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 1047, in _parse_statement
    expression = self._parse_set_operations(expression) if expression else self._parse_select()
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 1824, in _parse_select
    expressions = self._parse_csv(self._parse_expression)
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 3974, in _parse_csv
    parse_result = parse_method()
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 2622, in _parse_expression
    return self._parse_alias(self._parse_conjunction())
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 2625, in _parse_conjunction
    return self._parse_tokens(self._parse_equality, self.CONJUNCTION)
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 3990, in _parse_tokens
    this = parse_method()
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 2628, in _parse_equality
    return self._parse_tokens(self._parse_comparison, self.EQUALITY)
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 3990, in _parse_tokens
    this = parse_method()
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 2631, in _parse_comparison
    return self._parse_tokens(self._parse_range, self.COMPARISON)
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 3990, in _parse_tokens
    this = parse_method()
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 2634, in _parse_range
    this = self._parse_bitwise()
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 2726, in _parse_bitwise
    this = self._parse_term()
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 2749, in _parse_term
    return self._parse_tokens(self._parse_factor, self.TERM)
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 3990, in _parse_tokens
    this = parse_method()
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 2752, in _parse_factor
    return self._parse_tokens(self._parse_unary, self.FACTOR)
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 3990, in _parse_tokens
    this = parse_method()
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 2757, in _parse_unary
    return self._parse_at_time_zone(self._parse_type())
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 2766, in _parse_type
    this = self._parse_column()
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 2935, in _parse_column
    field = self._parse_star() or self._parse_function() or self._parse_id_var()
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 3047, in _parse_function
    this = parser(self)
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 703, in <lambda>
    "EXTRACT": lambda self: self._parse_extract(),
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 3482, in _parse_extract
    self.raise_error("Expected FROM or comma after EXTRACT", self._prev)
  File "/usr/local/lib/python3.10/site-packages/sqlglot/parser.py", line 945, in raise_error
    raise error
sqlglot.errors.ParseError: Expected FROM or comma after EXTRACT. Line 1, Col: 79.
  CREATE FUNCTION mydataset.extract(x ANY TYPE) AS (x); SELECT dataset.extract(1) AS y

Official Documentation
https://cloud.google.com/bigquery/docs/reference/standard-sql/user-defined-functions#sql-udf-structure

The next example creates the same function as a persistent UDF:

CREATE FUNCTION mydataset.AddFourAndDivide(x INT64, y INT64)
RETURNS FLOAT64
AS (
  (x + 4) / y
);

https://cloud.google.com/bigquery/docs/reference/standard-sql/user-defined-functions#limitations

The following limitations apply to persistent user-defined functions:
[...]

• When referencing a persistent UDF from another persistent UDF or a logical view, you must qualify the name with the dataset. For example:
  CREATE FUNCTION mydataset.referringFunction() AS (mydataset.referencedFunction());