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Status Not under consideration
Workspace z/OS
Categories DFSMS DFSORT
Created by Guest
Created on Jan 3, 2018

RELATED IDEAS

Variable length record INCLUDE substring comparison VLSHRT VLSCMP

I'm interested in the substring comparison specification in DFSORT's INCLUDE statement.

It would be nice if the (p1,m1,SS, EQ|NE,constant) specification for a substring comparison allowed for setting m1=0 to indicate from p1 to the end of the record.

The situation I'm thinking of is where there are variable-length records with some data of fixed length at the start followed by variable length data. You want to select those records for which this variable length data contains a particular string. You have no idea how long the variable data is.

You could do this using SORT control statements like this:
OPTION COPY,VLSHRT,VLSCMP
INCLUDE COND=(45,1,CH,EQ,C'L',AND,
46,1,CH,LT,X'02',AND,
1237,30000,SS,EQ,C'ENDLVL ')
but it seems to me that using VLSCMP must involve a fair amount of data movement for each input record.

If the final operand could be specified
1237,0,SS,EQ,C'ENDLVL ')
the input buffer could be scanned for the string and this data movement would be avoided and you wouldn't need to specify the VLSCMP option.

It seems to me that this would be a fairly painless enhancement to DFSORT's functionality...

Idea priority Low
  • Guest
    Reply
    |     Jan 29, 2024
    This item is a valid requirement but unlikely to be given high enough priority to be placed into the product plan.

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