My scrapbook about anything which I learned or want to remember, Sometime about tech tips, thoughts and rambling. If you find anything useful don't forget to give thumbs-up :)

Breaking

Wednesday, September 13, 2017

Evaluation Sequence in Transformer Stage - A Quick DataStage Recipe



Recipe:

What is evaluation sequence in Transformer Stage Or Order of Stage & Loop Variable and Derivations

Ingredients:

1. Transformer Stage
     a. Stage Variables
     b. Loop Variables
     c. Derivations


How To:

Evaluate each stage variable initial value
For each input row to process:
Evaluate each stage variable derivation value, unless the derivation is empty
For each output link:
Evaluate each column derivation value
Write the output record
Next output link
Next input row


** The stage variables and the columns within a link are evaluated in the order in which they are displayed in the Transformer editor. Similarly, the output links are also evaluated in the order in which they are displayed




Like the below page to get update  
https://www.facebook.com/datastage4you
https://twitter.com/datagenx
https://plus.google.com/+AtulSingh0/posts
https://datagenx.slack.com/messages/datascience/

Disclaimer

The postings on this site are my own and don't necessarily represent IBM's or other companies positions, strategies or opinions. All content provided on this blog is for informational purposes and knowledge sharing only.
The owner of this blog makes no representations as to the accuracy or completeness of any information on this site or found by following any link on this site. The owner will not be liable for any errors or omissions in this information nor for the availability of this information. The owner will not be liable for any losses, injuries, or damages from the display or use of his information.