On January 27, 2021, Google is changing the required permissions for attaching IAM roles to service accounts. If you are using IAM roles for your Google service accounts, please see Changes to User Management.
NOTE: If a column of values fails to match another data type, the column is typed as String data.
The length of an individual string value is limited only by the limit applied to an entire row of data, which is approximately 1 MB of characters.
NOTE: On export to relational systems, string lengths are limited to 256 for performance reasons.
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