fixed no timestamp event freshness query #3256

Job	Run time
test (latest_pre, bigquery) / test	17m 13s
test (1.3.0, postgres) / test	20m 35s
test (latest_pre, athena) / test	37m 10s
test (latest_pre, databricks) / test	17m 56s
test (latest_pre, postgres) / test	15m 38s
test (latest_pre, databricks_catalog) / test	18m 27s
test (latest_pre, redshift) / test	10m 28s
test (latest_pre, snowflake) / test	14m 53s
test (latest_pre, trino) / test	20m 9s
Notify Slack	0s
	2h 52m 29s

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