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Applies to: 
Databricks SQL Databricks Runtime
Returns the number of milliseconds since 1970-01-01 00:00:00 UTC.
unix_millis(expr)
expr: A TIMESTAMP expression.
A BIGINT.
The function truncates higher levels of precision.
> SELECT unix_millis(TIMESTAMP('1970-01-01 00:00:01Z'));
1000