Google BigQuery

Dremio uses Google Service Account Keys when connecting to Google BigQuery. To learn more about creating service account keys, see Create and delete service account keys.

Connect to Google BigQuery

1. In the Dremio console, click Add Data on the Home page.
2. In the Add Data dialog, select Google BigQuery.
3. Configure the connection using the sections below, then click Save.

General

1. In the Name field, specify the name of the connection. The name cannot include the following special characters: /, :, [, or ].
2. Under Connection, follow these steps:
   1. In the Host field, specify the URL for Google BigQuery.
   2. In the Port field, specify the port. The default port is 443.
   3. In the Project ID field, specify the Google Cloud Project ID.
3. Under Authentication, specify the service account Client Email and the Service Account Key (JSON). This connector assumes that the Service Account Key is a JSON Web Key. For more information on Google Cloud service account credentials, see Service account credentials.

Advanced Options

On the Advanced Options page, you can set values for these optional parameters:

Option	Description
Record fetch size	Number of records to fetch at once. Set to 0 (zero) to have Dremio automatically decide. By default, this is set to 200.
Maximum Idle Connections	The total number of connections allowed to be idle at a given time. The default number of maximum idle connections is 8.
Connection Idle Time	The amount of time (in seconds) allowed for a connection to remain idle before the connection is terminated. The default connection idle time is 6 seconds.
Query Timeout	The amount of time (in seconds) allowed to wait for the results of a query. If this time expires, the connection being used is returned to an idle state. Set the Query timeout to 0 for no timeout. The default Query timeout is 0.

Reflection Refresh

On the Reflection Refresh page, set the policy that controls how often Reflections are scheduled to be refreshed automatically, as well as the time limit after which Reflections expire and are removed.

Option	Description
Never refresh	Select to prevent automatic Reflection refresh, otherwise, the default is to refresh automatically.
Refresh every	How often to refresh Reflections, specified in hours, days or weeks. This option is ignored if Never refresh is selected.
Set refresh schedule	Specify the daily or weekly schedule.
Never expire	Select to prevent Reflections from expiring, otherwise, the default is to expire automatically after the time limit specified in Expire after.
Expire after	The time limit after which Reflections expire and are removed from Dremio, specified in hours, days or weeks. This option is ignored if Never expire is selected.

Metadata

On the Metadata page, you can configure settings to refresh metadata and handle datasets.

Dataset Handling

These are the optional Dataset Handling parameters.

Parameter	Description
Remove dataset definitions if underlying data is unavailable	By default, Dremio removes dataset definitions if underlying data is unavailable. Useful when files are temporarily deleted and added back in the same location with new sets of files.

Metadata Refresh

These are the optional Metadata Refresh parameters:

• Dataset Discovery: The refresh interval for fetching top-level object names such as databases and tables. Set the time interval using this parameter.

  Parameter	Description
  Fetch every	Set the frequency to fetch object names in minutes, hours, days, or weeks. The default is 1 hour.

• Dataset Details: The metadata that Dremio needs for query planning, such as information required for fields, types, shards, statistics, and locality. These are the parameters to fetch the dataset information.

  Parameter	Description
  Fetch mode	Choose to fetch only from queried datasets, which is set by default. Dremio updates details for previously queried objects.
  Fetch every	Set the frequency to fetch dataset details in minutes, hours, days, or weeks. The default is 1 hour.
  Expire after	Set the expiry time of dataset details in minutes, hours, days, or weeks. The default is 3 hours.

Privileges

This connection inherits privileges from Project settings. To grant specific users or roles additional privileges in this connection:

1. Enter the username or role name that you want to grant access to and click the Add to Privileges button. The added user or role is displayed in the USERS/ROLES table.
2. For the users or roles in the USERS/ROLES table, toggle the checkmark for each privilege you want to grant on the Dremio source that is being created.
3. Click Save after setting the configuration.

See Privileges for additional information about privileges.

Edit a Google BigQuery Connection

1. On the Open Catalog page, under Connections, right-click the connection and select Settings.
2. Update the connection configuration as needed.
3. Click Save.

Delete a Google BigQuery Connection

note

If the source is in a bad state (for example, Dremio cannot authenticate to the source or the source is otherwise unavailable), only users who belong to the ADMIN role can delete the source.

1. On the Open Catalog page, under Connections, right-click the connection and select Delete.
2. Click Delete to confirm.

Predicate Pushdowns

Dremio pushes the following operations to Google BigQuery:

*, +, -, /, %
<, <=, <>, =, >, >=, !=
AND, NOT, OR, ||
ABS
ACOS
ADD_MONTHS
ASIN
ATAN
ATAN2
AVG
CAST
CEIL
CEILING
CHAR_LENGTH
CHARACTER_LENGTH
CONCAT
COS
COT
DATE_ADD
DATE_SUB
DATE_TRUNC_DAY
DATE_TRUNC_HOUR
DATE_TRUNC_MINUTE
DATE_TRUNC_MONTH
DATE_TRUNC_YEAR
DEGREES
E
EXP
EXTRACT_DAY
EXTRACT_DOW
EXTRACT_DOY
EXTRACT_HOUR
EXTRACT_MINUTE
EXTRACT_MONTH
EXTRACT_QUARTER
EXTRACT_SECOND
EXTRACT_WEEK
EXTRACT_YEAR
FLOOR
IS DISTINCT FROM
IS NOT DISTINCT FROM
IS NOT NULL
IS NULL
LAST_DAY
LCASE
LEFT
LENGTH
LIKE
LN
LOCATE
LOG
LOG10
LOWER
LPAD
LTRIM
MAX
MEDIAN
MIN
MOD
MONTH
PERCENT_CONT
PERCENT_DISC
PI
POSITION
POW
POWER
RADIANS
RAND
REPLACE
REVERSE
RIGHT
ROUND
RPAD
RTRIM
SIGN
SIN
SQRT
SUBSTR
SUBSTRING
SUM
TAN
TIMESTAMPADD_DAY
TIMESTAMPADD_HOUR
TIMESTAMPADD_MINUTE
TIMESTAMPADD_MONTH
TIMESTAMPADD_QUARTER
TIMESTAMPADD_SECOND
TIMESTAMPADD_YEAR
TIMESTAMPDIFF_DAY
TIMESTAMPDIFF_HOUR
TIMESTAMPDIFF_MINUTE
TIMESTAMPDIFF_MONTH
TIMESTAMPDIFF_QUARTER
TIMESTAMPDIFF_SECOND
TIMESTAMPDIFF_WEEK
TIMESTAMPDIFF_YEAR
TO_DATE
TRIM
TRUNC
TRUNCATE
UCASE
UPPER
YEAR