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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




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