fixed no timestamp event freshness query #3255

Job	Run time
test (latest_pre, bigquery) / test	2m 39s
test (1.3.0, postgres) / test	7s
test (latest_pre, athena) / test	2m 37s
test (latest_pre, databricks) / test	2m 39s
test (latest_pre, databricks_catalog) / test	2m 38s
test (latest_pre, postgres) / test	6s
test (latest_pre, redshift) / test	2m 40s
test (latest_pre, snowflake) / test	2m 40s
test (latest_pre, trino) / test	7s
Notify Slack	0s
	16m 13s

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