As of January 1, 2020 this library no longer supports Python 2 on the latest released version. Library versions released prior to that date will continue to be available. For more information please visit Python 2 support on Google Cloud.

google.cloud.bigquery.job.QueryJob

class google.cloud.bigquery.job.QueryJob(job_id, query, client, job_config=None)

Asynchronous job: query tables.

Parameters

• job_id (str) – the job’s ID, within the project belonging to client.

• query (str) – SQL query string.

• client (google.cloud.bigquery.client.Client) – A client which holds credentials and project configuration for the dataset (which requires a project).

• job_config (Optional[google.cloud.bigquery.job.QueryJobConfig]) – Extra configuration options for the query job.

__init__(job_id, query, client, job_config=None)

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

Methods

__init__(job_id, query, client[, job_config])	Initialize self.
add_done_callback(fn)	Add a callback to be executed when the operation is complete.
cancel([client, retry, timeout])	API call: cancel job via a POST request
cancelled()	Check if the job has been cancelled.
done([retry, timeout, reload])	Refresh the job and checks if it is complete.
exception([timeout])	Get the exception from the operation, blocking if necessary.
exists([client, retry, timeout])	API call: test for the existence of the job via a GET request
from_api_repr(resource, client)	Factory: construct a job given its API representation
reload([client, retry, timeout])	API call: refresh job properties via a GET request.
result([page_size, max_results, retry, …])	Start the job and wait for it to complete and get the result.
running()	True if the operation is currently running.
set_exception(exception)	Set the Future’s exception.
set_result(result)	Set the Future’s result.
to_api_repr()	Generate a resource for _begin().
to_arrow([progress_bar_type, …])	[Beta] Create a class:pyarrow.Table by loading all pages of a table or query.
to_dataframe([bqstorage_client, dtypes, …])	Return a pandas DataFrame from a QueryJob

Attributes

allow_large_results	See google.cloud.bigquery.job.QueryJobConfig.allow_large_results.
billing_tier	Return billing tier from job statistics, if present.
cache_hit	Return whether or not query results were served from cache.
clustering_fields	See google.cloud.bigquery.job.QueryJobConfig.clustering_fields.
create_disposition	See google.cloud.bigquery.job.QueryJobConfig.create_disposition.
created	Datetime at which the job was created.
ddl_operation_performed	Return the DDL operation performed.
ddl_target_routine	Return the DDL target routine, present
ddl_target_table	Return the DDL target table, present
default_dataset	See google.cloud.bigquery.job.QueryJobConfig.default_dataset.
destination	See google.cloud.bigquery.job.QueryJobConfig.destination.
destination_encryption_configuration	Custom encryption configuration for the destination table.
dry_run	See google.cloud.bigquery.job.QueryJobConfig.dry_run.
ended	Datetime at which the job finished.
error_result	Error information about the job as a whole.
errors	Information about individual errors generated by the job.
estimated_bytes_processed	Return the estimated number of bytes processed by the query.
etag	ETag for the job resource.
flatten_results	See google.cloud.bigquery.job.QueryJobConfig.flatten_results.
job_id	ID of the job.
job_type	Type of job.
labels	Labels for the job.
location	Location where the job runs.
maximum_billing_tier	See google.cloud.bigquery.job.QueryJobConfig.maximum_billing_tier.
maximum_bytes_billed	See google.cloud.bigquery.job.QueryJobConfig.maximum_bytes_billed.
num_child_jobs	The number of child jobs executed.
num_dml_affected_rows	Return the number of DML rows affected by the job.
parent_job_id	Return the ID of the parent job.
path	URL path for the job’s APIs.
priority	See google.cloud.bigquery.job.QueryJobConfig.priority.
project	Project bound to the job.
query	The query text used in this query job.
query_parameters	See google.cloud.bigquery.job.QueryJobConfig.query_parameters.
query_plan	Return query plan from job statistics, if present.
range_partitioning	See google.cloud.bigquery.job.QueryJobConfig.range_partitioning.
referenced_tables	Return referenced tables from job statistics, if present.
schema_update_options	See google.cloud.bigquery.job.QueryJobConfig.schema_update_options.
script_statistics
self_link	URL for the job resource.
slot_millis	Slot-milliseconds used by this query job.
started	Datetime at which the job was started.
state	Status of the job.
statement_type	Return statement type from job statistics, if present.
table_definitions	See google.cloud.bigquery.job.QueryJobConfig.table_definitions.
time_partitioning	See google.cloud.bigquery.job.QueryJobConfig.time_partitioning.
timeline	Return the query execution timeline from job statistics.
total_bytes_billed	Return total bytes billed from job statistics, if present.
total_bytes_processed	Return total bytes processed from job statistics, if present.
udf_resources	See google.cloud.bigquery.job.QueryJobConfig.udf_resources.
undeclared_query_parameters	Return undeclared query parameters from job statistics, if present.
use_legacy_sql	See google.cloud.bigquery.job.QueryJobConfig.use_legacy_sql.
use_query_cache	See google.cloud.bigquery.job.QueryJobConfig.use_query_cache.
user_email	E-mail address of user who submitted the job.
write_disposition	See google.cloud.bigquery.job.QueryJobConfig.write_disposition.

add_done_callback(fn)

Add a callback to be executed when the operation is complete.

If the operation is not already complete, this will start a helper thread to poll for the status of the operation in the background.

Parameters

fn (Callable[Future]) – The callback to execute when the operation is complete.

property allow_large_results

See google.cloud.bigquery.job.QueryJobConfig.allow_large_results.

property billing_tier

Return billing tier from job statistics, if present.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.billing_tier

Returns

Billing tier used by the job, or None if job is not yet complete.

Return type

Optional[int]

property cache_hit

Return whether or not query results were served from cache.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.cache_hit

Returns

whether the query results were returned from cache, or None if job is not yet complete.

Return type

Optional[bool]

cancel(client=None, retry=<google.api_core.retry.Retry object>, timeout=None)

API call: cancel job via a POST request

See https://cloud.google.com/bigquery/docs/reference/rest/v2/jobs/cancel

Parameters

• client (Optional[google.cloud.bigquery.client.Client]) – the client to use. If not passed, falls back to the client stored on the current dataset.

• retry (Optional[google.api_core.retry.Retry]) – How to retry the RPC.

• timeout (Optional[float]) – The number of seconds to wait for the underlying HTTP transport before using retry

Returns

Boolean indicating that the cancel request was sent.

Return type

bool

cancelled()

Check if the job has been cancelled.

This always returns False. It’s not possible to check if a job was cancelled in the API. This method is here to satisfy the interface for google.api_core.future.Future.

Returns

False

Return type

bool

property clustering_fields

See google.cloud.bigquery.job.QueryJobConfig.clustering_fields.

property create_disposition

See google.cloud.bigquery.job.QueryJobConfig.create_disposition.

property created

Datetime at which the job was created.

Returns

the creation time (None until set from the server).

Return type

Optional[datetime.datetime]

property ddl_operation_performed

Return the DDL operation performed.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.ddl_operation_performed

Type

Optional[str]

property ddl_target_routine

Return the DDL target routine, present

for CREATE/DROP FUNCTION/PROCEDURE queries.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.ddl_target_routine

Type

Optional[google.cloud.bigquery.routine.RoutineReference]

property ddl_target_table

Return the DDL target table, present

for CREATE/DROP TABLE/VIEW queries.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.ddl_target_table

Type

Optional[google.cloud.bigquery.table.TableReference]

property default_dataset

See google.cloud.bigquery.job.QueryJobConfig.default_dataset.

property destination

See google.cloud.bigquery.job.QueryJobConfig.destination.

property destination_encryption_configuration

Custom encryption configuration for the destination table.

Custom encryption configuration (e.g., Cloud KMS keys) or None if using default encryption.

See google.cloud.bigquery.job.QueryJobConfig.destination_encryption_configuration.

Type

google.cloud.bigquery.encryption_configuration.EncryptionConfiguration

done(retry=<google.api_core.retry.Retry object>, timeout=None, reload=True)

Refresh the job and checks if it is complete.

Parameters

• retry (Optional[google.api_core.retry.Retry]) – How to retry the call that retrieves query results.

• timeout (Optional[float]) – The number of seconds to wait for the underlying HTTP transport before using retry.

• reload (Optional[bool]) – If True, make an API call to refresh the job state of unfinished jobs before checking. Default True.

Returns

True if the job is complete, False otherwise.

Return type

bool

property dry_run

See google.cloud.bigquery.job.QueryJobConfig.dry_run.

property ended

Datetime at which the job finished.

Returns

the end time (None until set from the server).

Return type

Optional[datetime.datetime]

property error_result

Error information about the job as a whole.

Returns

the error information (None until set from the server).

Return type

Optional[Mapping]

property errors

Information about individual errors generated by the job.

Returns

the error information (None until set from the server).

Return type

Optional[List[Mapping]]

property estimated_bytes_processed

Return the estimated number of bytes processed by the query.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.estimated_bytes_processed

Returns

number of DML rows affected by the job, or None if job is not yet complete.

Return type

Optional[int]

property etag

ETag for the job resource.

Returns

the ETag (None until set from the server).

Return type

Optional[str]

exception(timeout=None)

Get the exception from the operation, blocking if necessary.

Parameters

timeout (int) – How long to wait for the operation to complete. If None, wait indefinitely.

Returns

The operation’s

error.

Return type

Optional[google.api_core.GoogleAPICallError]

exists(client=None, retry=<google.api_core.retry.Retry object>, timeout=None)

API call: test for the existence of the job via a GET request

See https://cloud.google.com/bigquery/docs/reference/rest/v2/jobs/get

Parameters

• client (Optional[google.cloud.bigquery.client.Client]) – the client to use. If not passed, falls back to the client stored on the current dataset.

• retry (Optional[google.api_core.retry.Retry]) – How to retry the RPC.

• timeout (Optional[float]) – The number of seconds to wait for the underlying HTTP transport before using retry.

Returns

Boolean indicating existence of the job.

Return type

bool

property flatten_results

See google.cloud.bigquery.job.QueryJobConfig.flatten_results.

classmethod from_api_repr(resource, client)

Factory: construct a job given its API representation

Parameters

• resource (Dict) – dataset job representation returned from the API

• client (google.cloud.bigquery.client.Client) – Client which holds credentials and project configuration for the dataset.

Returns

Job parsed from resource.

Return type

google.cloud.bigquery.job.QueryJob

property job_id

ID of the job.

Type

str

property job_type

Type of job.

Returns

one of ‘load’, ‘copy’, ‘extract’, ‘query’.

Return type

str

property labels

Labels for the job.

Type

Dict[str, str]

property location

Location where the job runs.

Type

str

property maximum_billing_tier

See google.cloud.bigquery.job.QueryJobConfig.maximum_billing_tier.

property maximum_bytes_billed

See google.cloud.bigquery.job.QueryJobConfig.maximum_bytes_billed.

property num_child_jobs

The number of child jobs executed.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics.FIELDS.num_child_jobs

Returns

int

property num_dml_affected_rows

Return the number of DML rows affected by the job.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.num_dml_affected_rows

Returns

number of DML rows affected by the job, or None if job is not yet complete.

Return type

Optional[int]

property parent_job_id

Return the ID of the parent job.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics.FIELDS.parent_job_id

Returns

parent job id.

Return type

Optional[str]

property path

URL path for the job’s APIs.

Returns

the path based on project and job ID.

Return type

str

property priority

See google.cloud.bigquery.job.QueryJobConfig.priority.

property project

Project bound to the job.

Returns

the project (derived from the client).

Return type

str

property query

The query text used in this query job.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobConfigurationQuery.FIELDS.query

Type

str

property query_parameters

See google.cloud.bigquery.job.QueryJobConfig.query_parameters.

property query_plan

Return query plan from job statistics, if present.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.query_plan

Returns

mappings describing the query plan, or an empty list if the query has not yet completed.

Return type

List[google.cloud.bigquery.job.QueryPlanEntry]

property range_partitioning

See google.cloud.bigquery.job.QueryJobConfig.range_partitioning.

property referenced_tables

Return referenced tables from job statistics, if present.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.referenced_tables

Returns

mappings describing the query plan, or an empty list if the query has not yet completed.

Return type

List[Dict]

reload(client=None, retry=<google.api_core.retry.Retry object>, timeout=None)

API call: refresh job properties via a GET request.

See https://cloud.google.com/bigquery/docs/reference/rest/v2/jobs/get

Parameters

• client (Optional[google.cloud.bigquery.client.Client]) – the client to use. If not passed, falls back to the client stored on the current dataset.

• retry (Optional[google.api_core.retry.Retry]) – How to retry the RPC.

• timeout (Optional[float]) – The number of seconds to wait for the underlying HTTP transport before using retry.

result(page_size=None, max_results=None, retry=<google.api_core.retry.Retry object>, timeout=None, start_index=None)

Start the job and wait for it to complete and get the result.

Parameters

• page_size (Optional[int]) – The maximum number of rows in each page of results from this request. Non-positive values are ignored.

• max_results (Optional[int]) – The maximum total number of rows from this request.

• retry (Optional[google.api_core.retry.Retry]) – How to retry the call that retrieves rows.

• timeout (Optional[float]) – The number of seconds to wait for the underlying HTTP transport before using retry. If multiple requests are made under the hood, timeout applies to each individual request.

• start_index (Optional[int]) – The zero-based index of the starting row to read.

Returns

Iterator of row data Row-s. During each page, the iterator will have the total_rows attribute set, which counts the total number of rows in the result set (this is distinct from the total number of rows in the current page: iterator.page.num_items).

If the query is a special query that produces no results, e.g. a DDL query, an _EmptyRowIterator instance is returned.

Return type

google.cloud.bigquery.table.RowIterator

Raises

• google.cloud.exceptions.GoogleAPICallError – If the job failed.

• concurrent.futures.TimeoutError – If the job did not complete in the given timeout.

running()

True if the operation is currently running.

property schema_update_options

See google.cloud.bigquery.job.QueryJobConfig.schema_update_options.

property self_link

URL for the job resource.

Returns

the URL (None until set from the server).

Return type

Optional[str]

set_exception(exception)

Set the Future’s exception.

set_result(result)

Set the Future’s result.

property slot_millis

Slot-milliseconds used by this query job.

Type

Union[int, None]

property started

Datetime at which the job was started.

Returns

the start time (None until set from the server).

Return type

Optional[datetime.datetime]

property state

Status of the job.

Returns

the state (None until set from the server).

Return type

Optional[str]

property statement_type

Return statement type from job statistics, if present.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.statement_type

Returns

type of statement used by the job, or None if job is not yet complete.

Return type

Optional[str]

property table_definitions

See google.cloud.bigquery.job.QueryJobConfig.table_definitions.

property time_partitioning

See google.cloud.bigquery.job.QueryJobConfig.time_partitioning.

property timeline

Return the query execution timeline from job statistics.

Type

List(TimelineEntry)

to_api_repr()

Generate a resource for _begin().

to_arrow(progress_bar_type=None, bqstorage_client=None, create_bqstorage_client=True)

[Beta] Create a class:pyarrow.Table by loading all pages of a table or query.

Parameters

• progress_bar_type (Optional[str]) –

  If set, use the tqdm library to display a progress bar while the data downloads. Install the tqdm package to use this feature.

  Possible values of progress_bar_type include:

  None

  No progress bar.

  'tqdm'

  Use the tqdm.tqdm() function to print a progress bar to sys.stderr.

  'tqdm_notebook'

  Use the tqdm.tqdm_notebook() function to display a progress bar as a Jupyter notebook widget.

  'tqdm_gui'

  Use the tqdm.tqdm_gui() function to display a progress bar as a graphical dialog box.

• bqstorage_client (Optional[google.cloud.bigquery_storage_v1.BigQueryReadClient]) –

  A BigQuery Storage API client. If supplied, use the faster BigQuery Storage API to fetch rows from BigQuery. This API is a billable API.

  This method requires the pyarrow and google-cloud-bigquery-storage libraries.

  Reading from a specific partition or snapshot is not currently supported by this method.

• create_bqstorage_client (Optional[bool]) –

  If True (default), create a BigQuery Storage API client using the default API settings. The BigQuery Storage API is a faster way to fetch rows from BigQuery. See the bqstorage_client parameter for more information.

  This argument does nothing if bqstorage_client is supplied.

  ..versionadded:: 1.24.0

Returns

pyarrow.Table

A pyarrow.Table populated with row data and column headers from the query results. The column headers are derived from the destination table’s schema.

Raises

ValueError – If the pyarrow library cannot be imported.

..versionadded:: 1.17.0

to_dataframe(bqstorage_client=None, dtypes=None, progress_bar_type=None, create_bqstorage_client=True, date_as_object=True)

Return a pandas DataFrame from a QueryJob

Parameters

• bqstorage_client (Optional[google.cloud.bigquery_storage_v1.BigQueryReadClient]) –

  A BigQuery Storage API client. If supplied, use the faster BigQuery Storage API to fetch rows from BigQuery. This API is a billable API.

  This method requires the fastavro and google-cloud-bigquery-storage libraries.

  Reading from a specific partition or snapshot is not currently supported by this method.

• dtypes (Optional[Map[str, Union[str, pandas.Series.dtype]]]) – A dictionary of column names pandas dtype``s. The provided ``dtype is used when constructing the series for the column specified. Otherwise, the default pandas behavior is used.

• progress_bar_type (Optional[str]) –

  If set, use the tqdm library to display a progress bar while the data downloads. Install the tqdm package to use this feature.

  See to_dataframe() for details.

  ..versionadded:: 1.11.0

• create_bqstorage_client (Optional[bool]) –

  If True (default), create a BigQuery Storage API client using the default API settings. The BigQuery Storage API is a faster way to fetch rows from BigQuery. See the bqstorage_client parameter for more information.

  This argument does nothing if bqstorage_client is supplied.

  ..versionadded:: 1.24.0

• date_as_object (Optional[bool]) –

  If True (default), cast dates to objects. If False, convert to datetime64[ns] dtype.

  ..versionadded:: 1.26.0

Returns

A DataFrame populated with row data and column headers from the query results. The column headers are derived from the destination table’s schema.

Raises

ValueError – If the pandas library cannot be imported.

property total_bytes_billed

Return total bytes billed from job statistics, if present.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.total_bytes_billed

Returns

Total bytes processed by the job, or None if job is not yet complete.

Return type

Optional[int]

property total_bytes_processed

Return total bytes processed from job statistics, if present.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.total_bytes_processed

Returns

Total bytes processed by the job, or None if job is not yet complete.

Return type

Optional[int]

property udf_resources

See google.cloud.bigquery.job.QueryJobConfig.udf_resources.

property undeclared_query_parameters

Return undeclared query parameters from job statistics, if present.

See: https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobStatistics2.FIELDS.undeclared_query_parameters

Returns

Undeclared parameters, or an empty list if the query has not yet completed.

Return type

List[Union[ google.cloud.bigquery.query.ArrayQueryParameter, google.cloud.bigquery.query.ScalarQueryParameter, google.cloud.bigquery.query.StructQueryParameter ]]

property use_legacy_sql

See google.cloud.bigquery.job.QueryJobConfig.use_legacy_sql.

property use_query_cache

See google.cloud.bigquery.job.QueryJobConfig.use_query_cache.

property user_email

E-mail address of user who submitted the job.

Returns

the URL (None until set from the server).

Return type

Optional[str]

property write_disposition

See google.cloud.bigquery.job.QueryJobConfig.write_disposition.