It is GoogleSQL(BigQuery, Cloud Spanner) dialect format server using ZetaSQL. It runs on Cloud Run(and Knative Serving).
(Note: It takes very long time. Consider to use Boost mode or build on more powerful machine.)
$ SERVICE_URL=$(gcloud beta run services describe --format="value(status.domain)" ${REPO_NAME})
$ curl ${SERVICE_URL} --data 'SELECT * FROM tbl'
SELECT
*
FROM
tbl