The repeated evaluation of equal sub-access paths for one object should be avoided for performance reasons when filling the list display columns:
With an active OPTIMIZE flag, 'a' is evaluated only once instead of
three times without OPTIMIZE. 'b.c' will be calculated only once, instead
of twice.
The evaluation order will still be the same as the format statement order.
Since a tree structure is generated internally (see image), the already known
result 'a.b.c'
can be used again when evaluating 'a.b.c.f'; and when evaluating 'a.g.h',
the repeated evaluation of 'a'
is no longer required.
This is especially important, if there are function calls or the call of InstantView®
with call
behind these sub-terms a, b, c... .