Advantage of using Build-op over tranformer or any stage

manishsk · Post by **manishsk** » Tue Jul 31, 2007 9:32 pm

Hi

This is a bit open-ended question.

In one of the jobs i am developing I used build-op instead of transformer for column level tranformation. Although I didn't have much data but in future it is more likely that i will get huge amount data for the particular job.

I was just thinking, is there any advantage over using build-op over transformer for 1 or 2 column level transformation. ( in my job it was actually used for a range lookup, i used Join stage [left outer join] and build op (check min max between condtion) to solve the purpose). As far as I know using transformer it creates a separate child process and separate object code. Does it happens with build-op too?

Also i usually prefer using join/merge stage over lookup, and transformer stage? Does build-op gives any advantage w.r.t performance over here apart from the simplicity of the code? Anything else you can think of please let me know w.r.t. advantages please let me know.

Thanks,
M

ray.wurlod · Post by **ray.wurlod** » Tue Jul 31, 2007 10:13 pm

These days what a Transformer stage is, to all intents and purposes, is a BuildOp generator. Look at the generated code to see what I mean - though it's rather better documented than a lot of user-written BuildOps!

manishsk · Post by **manishsk** » Tue Jul 31, 2007 11:06 pm

ray.wurlod wrote:These days what a Transformer stage is, to all intents and purposes, is a BuildOp generator. Look at the generated code to see what I mean - though it's rather better documented than a lot of user-wr ...

Can't see your reply as I am not a pemium member. Anyways thanks for the reply. Anyone has anything else to comment please put on as will be helpful to others too.

ray.wurlod · Post by **ray.wurlod** » Wed Aug 01, 2007 12:54 am

You only missed a word and a half! And unimportant ones at that. On that basis I've removed the Premium flag.

manishsk · Post by **manishsk** » Wed Aug 01, 2007 1:06 am

ray.wurlod wrote:You only missed a word and a half! And unimportant ones at that. On that basis I've removed the Premium flag.

Thanks a lot ray!

I think you are correct, the question came in my mind simply because i felt the build-op's might get treated as part of complete generated code than having separate object code of it like transformer, which may in turn give some sort of performance benefit. but thats not the case.

Thanks.