count_distinct — aggregate function to return the count of rows in the specified column that have distinct values
This function returns the count of rows in the specified column that have distinct values. The
expr argument must be a literal column name in the current table, or a simple expression that resolves to a column name.
As of 10.4.4, this function is deprecated but still supported for backward compatibility.
This LiveView aggregate function is based on the count_distinct aggregate function in the StreamBase expression language.