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Handle nullable field values #945

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Handle nullable field values #945

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1979efd
Have Query from_repr support the 'kind' format generated by to_repr
todddialpad May 14, 2021
aa6723c
Fix indent
todddialpad May 14, 2021
68cc95f
Merge branch 'talkiq:master' into master
todddialpad Nov 20, 2021
dd91b1b
Merge branch 'talkiq:master' into master
todddialpad Oct 9, 2024
e9079bb
Merge branch 'talkiq:master' into master
todddialpad Feb 1, 2025
7195e36
Merge branch 'talkiq:master' into master
todddialpad Sep 17, 2025
c5e8a13
Handle nullable field values
todddialpad Sep 17, 2025
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36 changes: 19 additions & 17 deletions bigquery/gcloud/aio/bigquery/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -74,22 +74,22 @@ def parse(field: Dict[str, Any], value: Any) -> Any:
represent in a backwards-enough compatible fashion.
"""
try:
convert: Callable[[Any], Any] = { # type: ignore[assignment]
'BIGNUMERIC': lambda x: decimal.Decimal(
convert: Callable[[Any, bool], Any] = { # type: ignore[assignment]
'BIGNUMERIC': lambda x, nullable: decimal.Decimal(
x, decimal.Context(prec=77),
),
'BOOLEAN': lambda x: x == 'true',
'BYTES': bytes,
'FLOAT': float,
'INTEGER': int,
'NUMERIC': lambda x: decimal.Decimal(
) if x is not None or not nullable else None,
'BOOLEAN': lambda x, nullable: x == 'true' if x is not None or not nullable else None,
'BYTES': lambda x, nullable: bytes(x) if x is not None or not nullable else None,
'FLOAT': lambda x, nullable: float(x) if x is not None or not nullable else None,
'INTEGER': lambda x, nullable: int(x) if x is not None or not nullable else None,
'NUMERIC': lambda x, nullable: decimal.Decimal(
x, decimal.Context(prec=38),
),
'RECORD': dict,
'STRING': str,
'TIMESTAMP': lambda x: datetime.datetime.fromtimestamp(
) if x is not None or not nullable else None,
'RECORD': lambda x, nullable: dict(x) if x is not None or not nullable else None,
'STRING': lambda x, nullable: str(x) if x is not None or not nullable else None,
'TIMESTAMP': lambda x, nullable: datetime.datetime.fromtimestamp(
float(x), tz=utc,
),
) if x is not None or not nullable else None,
}[field['type']]
except KeyError:
# TODO: determine the proper methods for converting the following:
Expand All @@ -104,7 +104,8 @@ def parse(field: Dict[str, Any], value: Any) -> Any:
)
raise

if field['mode'] == 'NULLABLE' and value is None:
nullable = field['mode'] == 'NULLABLE'
if nullable and value is None:
return value

if field['mode'] == 'REPEATED':
Expand All @@ -115,15 +116,16 @@ def parse(field: Dict[str, Any], value: Any) -> Any:
}
for xs in flatten(value)]

return [convert(x) for x in flatten(value)]
return ([convert(x, False) for x in flatten(value)]
if value is not None or not nullable else None)

if field['type'] == 'RECORD':
return {
f['name']: parse(f, x)
for f, x in zip(field['fields'], flatten(value))
}
} if value is not None or not nullable else None

return convert(flatten(value))
return convert(flatten(value), nullable)


def query_response_to_dict(response: Dict[str, Any]) -> List[Dict[str, Any]]:
Expand Down