CURRENT_ROW_TIMESTAMP is a SQLstream extension to the SQL standard. This function returns the current timestamp as defined by the computer on which the s-Server is running. CURRENT_ROW_TIMESTAMP is always returned as UTC, not the local timezone.
CURRENT_ROW_TIMESTAMP is similar to LOCALTIMESTAMP, but returns a new timestamp for each row in a stream.
A query run with LOCALTIMESTAMP (or CURRENT_TIMESTAMP or CURRENT_TIME) as one of the columns puts into all output rows the time the query is first run.
If that column instead contains CURRENT_ROW_TIMESTAMP, each output row gets a newly-calculated value of TIME representing when that row was output.