Client

BigQuery

Environment

Production on GKE
go version: go1.25.7

Code and Dependencies

package: cloud.google.com/go/bigquery v1.73.0

Expected behavior

Query results are returned successfully (same as v1.72.0 and earlier).

Actual behavior

Query fails with:

googleapi: Error 400: timestamp_output_format is not supported yet., invalid

Additional context

Started after upgrading to cloud.google.com/go/bigquery v1.73.0.
The v1.73.0 release includes transition format options (#13422) (commit 59efe32 ), which appears to replace UseInt64Timestamp with TimestampOutputFormat=INT64. The BigQuery REST API seems to reject timestamp_output_format currently, causing a regression.

Related issue: googleapis/google-cloud-go#13786