[Bug translator/2610] New: @ops on empty scalar statistics aggregates

[fche at redhat dot com]

For arrays of aggregates, accessing a nonexistent value results in an error:

   a[2] <<< 2; @avg(a[3])

This is intentional, since @avg is considered undefined for a zero-element
list.  However, for scalars, we don't enforce this same thing:

   @avg(b) ; @max(b)

may spit out a generic division-by-zero error or a sentinel "0" value.
It should be made consistent with the vector-of-aggregates case, so that
only @count() is valid on an empty aggregate scalar.

-- 
           Summary: @ops on empty scalar statistics aggregates
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=2610

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