asSQLExpression() failed when executed several times on the same instance,
because too much code was skipped when 'column_map' is cached.

Avoid getting the list twice, follow coding style, explicitly access portal
methods on portal.

Remove condition to test if the event path destination predicate applies for this destination. On this this case, we can trust on the previous selection using the domain

call getObject() once explicitly to reduce number of calls.