Class SchemaField (3.4.0)

Version 3.4.0

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SchemaField(name: str, field_type: str, mode: str = 'NULLABLE', default_value_expression: Optional[str] = None, description: Union[str, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>, fields: Iterable[google.cloud.bigquery.schema.SchemaField] = (), policy_tags: Union[google.cloud.bigquery.schema.PolicyTagList, None, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>, precision: Union[int, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>, scale: Union[int, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>, max_length: Union[int, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>)

Describe a single field within a table schema.

Inheritance

builtins.object > SchemaField

Properties

default_value_expression

Optional[str] default value of a field, using an SQL expression

description

Optional[str]: description for the field.

field_type

str: The type of the field.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/tables#TableFieldSchema.FIELDS.type

fields

Optional[tuple]: Subfields contained in this field.

Must be empty unset if field_type is not 'RECORD'.

is_nullable

bool: whether 'mode' is 'nullable'.

max_length

Optional[int]: Maximum length for the STRING or BYTES field.

mode

Optional[str]: The mode of the field.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/tables#TableFieldSchema.FIELDS.mode

name

str: The name of the field.

policy_tags

Optional[google.cloud.bigquery.schema.PolicyTagList]: Policy tag list definition for this field.

precision

Optional[int]: Precision (number of digits) for the NUMERIC field.

scale

Optional[int]: Scale (digits after decimal) for the NUMERIC field.

Methods

from_api_repr

from_api_repr(api_repr: dict)

Return a SchemaField object deserialized from a dictionary.

Parameter
Name	Description
api_repr	Mapping[str, str] The serialized representation of the SchemaField, such as what is output by to_api_repr.

Returns
Type	Description
google.cloud.bigquery.schema.SchemaField	The SchemaField object.

to_api_repr

to_api_repr()

Return a dictionary representing this schema field.

Returns
Type	Description
Dict	A dictionary representing the SchemaField in a serialized form.

to_standard_sql

to_standard_sql()

Return the field as the standard SQL field representation object.

__init__

__init__(name: str, field_type: str, mode: str = 'NULLABLE', default_value_expression: Optional[str] = None, description: Union[str, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>, fields: Iterable[google.cloud.bigquery.schema.SchemaField] = (), policy_tags: Union[google.cloud.bigquery.schema.PolicyTagList, None, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>, precision: Union[int, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>, scale: Union[int, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>, max_length: Union[int, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>)

Initialize self. See help(type(self)) for accurate signature.

SchemaField

SchemaField(name: str, field_type: str, mode: str = 'NULLABLE', default_value_expression: Optional[str] = None, description: Union[str, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>, fields: Iterable[google.cloud.bigquery.schema.SchemaField] = (), policy_tags: Union[google.cloud.bigquery.schema.PolicyTagList, None, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>, precision: Union[int, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>, scale: Union[int, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>, max_length: Union[int, google.cloud.bigquery.schema._DefaultSentinel] = <_DefaultSentinel.DEFAULT_VALUE: <object object>>)

Describe a single field within a table schema.