bigint function
Applies to: 
Databricks SQL Databricks Runtime
Casts the value expr to BIGINT. This function is a synonym for CAST(expr AS BIGINT). See cast function for details.
Syntax
bigint(expr)
Arguments
expr: Any expression which is castable to BIGINT.
Returns
A BIGINT.
Examples
SQL
> SELECT bigint(current_timestamp);
1616168320
> SELECT bigint('5');
5