[CMS-PIPELINES] Oddity

[Schuh, Richard]

I have two pipes, below, that are identical in every respect except that
one has a seemingly superfluous stage, "| COPY" inserted prior to the
output. The first writes nothing to the file while the latter pipe does
write. The all. Stem contains 302 entries; only 48 of them match the
exception list, stem except. Both pipes agree in this respect What is
going on here? Why is the copy stage needed before any following stages
can run?

q cmslevel

CMS Level 22, Service Level 701

RSCHUH CMS 22 (CMS22B);

pipe q | cons

FPLINX086I CMS/TSO Pipelines, 5741-A05/5655-A17 1.0110
(Version.Release/Mod) - Generated 11 Oct 2005 at 12:04:21 
RSCHUH CMS 22 (CMS22B);





'PIPE (end \ name Sep)',                                
'\ stem all.',                       
   '| l: lookup w1 details master',
   '| join /;/',                   
   '| stem ex.',                    
'\ stem except.',                  
   '| l:',                         
   '| > fn ft fm'                    

                                   
'PIPE (end \ name Sep)',           
'\ stem all.',                       
   '| l: lookup w1 details master',
   '| join /;/',                   
   '| stem ex.',                    
'\ stem except.',                  
   '| l:',                         
'| COPY',                       
   '| > fn ft fm'                    

Regards, 
Richard Schuh