tBigQueryInput Standard properties - 7.3

Schema and Edit schema

A schema is a row description. It defines the number of fields (columns) to be processed and passed on to the next component. When you create a Spark Job, avoid the reserved word line when naming the fields.

• Built-In: You create and store the schema locally for this component only.

• Repository: You have already created the schema and stored it in the Repository. You can reuse it in various projects and Job designs.

• View schema: choose this option to view the schema only.

• Change to built-in property: choose this option to change the schema to Built-in for local changes.

• Update repository connection: choose this option to change the schema stored in the repository and decide whether to propagate the changes to all the Jobs upon completion. If you just want to propagate the changes to the current Job, you can select No upon completion and choose this schema metadata again in the Repository Content window.

This component offers the advantage of the dynamic schema feature. This allows you to retrieve unknown columns from source files or to copy batches of columns from a source without mapping each column individually. For further information about dynamic schemas, see Talend Studio User Guide.

This dynamic schema feature is designed for the purpose of retrieving unknown columns of a table and is recommended to be used for this purpose only; it is not recommended for the use of creating tables.

• The Record type of BigQuery is not supported.
• The columns for table metadata such as the Description column or the Mode column cannot be retrieved.
• The Timestamp data from your BigQuery system is formated to be String data.
• The numeric data of BigQuery is converted to BigDecimal.

• Service account: authenticate using a Google account that is associated with your Google Cloud Platform project. When selecting this mode, the parameter to be defined in the Basic settings view is Service account credentials file.
• OAuth 2.0: authenticate the access using OAuth credentials. When selecting this mode, the parameters to be defined in the Basic settings view are Client ID, Client secret and Authorization code.
• OAuth Access Token: authenticate using an OAuth access token. When selecting this mode, the parameter to be defined in the Basic settings view is OAuth Access Token.

For further information about how to create a Google service account and obtain the credentials file, see Getting Started with Authentication from the Google documentation.

Client ID and Client secret

Paste the client ID and the client secret, both created and viewable on the API Access tab view of the project hosting the Google BigQuery service and the Cloud Storage service you need to use.

To enter the client secret, click the [...] button next to the client secret field, and then in the pop-up dialog box enter the client secret between double quotes and click OK to save the settings.

The lifetime of the token is one hour. The component does not perform the token refresh operation but will fetch the new access token to operate beyond the one-hour limit.

Project ID

Paste the ID of the project hosting the Google BigQuery service you need to use.

The ID of your project can be found in the URL of the Google API Console, or by hovering your mouse pointer over the name of the project in the BigQuery Browser Tool.

Authorization code

Paste the authorization code provided by Google for the access you are building.

To obtain the authorization code, you need to execute the Job using this component and when this Job pauses execution to print out an URL address, you navigate to this address to copy the authorization code displayed.

Use legacy SQL and Query

If the query to be used is the legacy SQL of BigQuery, select this Use legacy SQL check box. For further information about this legacy SQL, see Legacy SQL query reference from the Google BigQuery documentation.

Result size

Select the option depending on the volume of the query result.

By default, the Small option is used, but when the query result is larger than the maximum response size, you need to select the Large option.

If the volume of the result is not certain, select Auto.

token properties File Name

Enter the path to, or browse to the refresh token file you need to use.

At the first Job execution using the Authorization code you have obtained from Google BigQuery, the value in this field is the directory and the name of that refresh token file to be created and used; if that token file has been created and you need to reuse it, you have to specify its directory and file name in this field.

With only the token file name entered, Talend Studio considers the directory of that token file to be the root of the Studio folder.

For further information about the refresh token, see the manual of Google BigQuery.

Advanced Separator (for number)

Select this check box to change the separator used for the numbers.

Encoding

Select the encoding from the list or select Custom and define it manually. This field is compulsory for database data handling. The supported encodings depend on the JVM that you are using. For more information, see https://docs.oracle.com.

Force single query execution

Select this check box to let the component return the result of the whole query. If you clear this check box, the component executes each sub-query separately and returns the result of each query sequentially.

Select this check box to use an existing dataset to which you have access, instead of creating one, and in the field that is displayed, enter the name of this dataset. This way, you avoid rights and permissions issues related to dataset creation.

This check box is available only when you have selected Large from the Result size drop-down list in the Basic settings tab.

tStatCatcher Statistics

Select this check box to collect the log data at the component level.

ERROR_MESSAGE

The error message generated by the component when an error occurs. This is an After variable and it returns a string. This variable functions only if the Die on error check box is selected.

JOBID

STATISTICS

STATISTICS_CHILD

Usage rule

This is an input component. It sends the extracted data to the component that follows it.

This component automatically detects and supports both multi-regional locations and regional locations. When using the regional locations, the buckets and the datasets to be used must be in the same locations.