Oracle: JSON_OBJECT(*) results in ParseError

[lucean]

Attempting to use JSON_OBJECT(*) in Oracle results in a ParseError.

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

Python 3.11.3 (main, Apr  7 2023, 19:25:52) [Clang 14.0.0 (clang-1400.0.29.202)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sqlglot
>>> sqlglot.parse_one("SELECT JSON_OBJECT(*) FROM DUAL", read="oracle")

Result:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.11/site-packages/sqlglot/__init__.py", line 158, in parse_one
    result = dialect.parse(sql, **opts)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/dialects/dialect.py", line 217, in parse
    return self.parser(**opts).parse(self.tokenize(sql), sql)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 856, in parse
    return self._parse(
           ^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 922, in _parse
    expressions.append(parse_method(self))
                       ^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 1112, in _parse_statement
    expression = self._parse_set_operations(expression) if expression else self._parse_select()
                                                                           ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 1877, in _parse_select
    expressions = self._parse_csv(self._parse_expression)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 4135, in _parse_csv
    parse_result = parse_method()
                   ^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 2722, in _parse_expression
    return self._parse_alias(self._parse_conjunction())
                             ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 2725, in _parse_conjunction
    return self._parse_tokens(self._parse_equality, self.CONJUNCTION)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 4149, in _parse_tokens
    this = parse_method()
           ^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 2728, in _parse_equality
    return self._parse_tokens(self._parse_comparison, self.EQUALITY)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 4149, in _parse_tokens
    this = parse_method()
           ^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 2731, in _parse_comparison
    return self._parse_tokens(self._parse_range, self.COMPARISON)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 4149, in _parse_tokens
    this = parse_method()
           ^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 2734, in _parse_range
    this = self._parse_bitwise()
           ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 2831, in _parse_bitwise
    this = self._parse_term()
           ^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 2852, in _parse_term
    return self._parse_tokens(self._parse_factor, self.TERM)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 4149, in _parse_tokens
    this = parse_method()
           ^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 2855, in _parse_factor
    return self._parse_tokens(self._parse_unary, self.FACTOR)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 4149, in _parse_tokens
    this = parse_method()
           ^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 2860, in _parse_unary
    return self._parse_at_time_zone(self._parse_type())
                                    ^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 2869, in _parse_type
    this = self._parse_column()
           ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/dialects/oracle.py", line 79, in _parse_column
    column = super()._parse_column()
             ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 3020, in _parse_column
    this = self._parse_field()
           ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 3124, in _parse_field
    or self._parse_function(anonymous=anonymous_func)
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 3156, in _parse_function
    this = parser(self)
           ^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 716, in <lambda>
    "JSON_OBJECT": lambda self: self._parse_json_object(),
                                ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 3752, in _parse_json_object
    expressions = self._parse_csv(self._parse_json_key_value)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 4135, in _parse_csv
    parse_result = parse_method()
                   ^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 3749, in _parse_json_key_value
    return self.expression(exp.JSONKeyValue, this=key, expression=value)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 986, in expression
    return self.validate_expression(instance)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 1006, in validate_expression
    self.raise_error(error_message)
  File "/usr/local/lib/python3.11/site-packages/sqlglot/parser.py", line 966, in raise_error
    raise error
sqlglot.errors.ParseError: Required keyword: 'expression' missing for <class 'sqlglot.expressions.JSONKeyValue'>. Line 1, Col: 21.
  SELECT JSON_OBJECT(*) FROM DUAL

Official Documentation
https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/JSON_OBJECT.html

Also,

https://docs.oracle.com/en/database/oracle/oracle-database/21/adjsn/generation.html#GUID-1084A518-A44A-4654-A796-C1DD4D8EC2AA

[georgesittas]

Thanks for the report! I'll take a look shortly.

[tobymao]

this is similar to snowflake _parse_object_construct @georgesittas