string expression

arkiboys 9,701 Reputation points
2021-11-12T10:10:57.117+00:00

In mapping data flow, how is it possible to execute an expression which is retrieved from a config file?
For example, in value expression, I can run expressions like lower($$) which is fine but I would like to know how to know how to run this expression if this is passed in?
Example:
lower($$) --> works as expected which is that it converts values into lower case
expr('lower($$)') --> works as expected which is that it converts values into lower case
Config#lookup($0).Expression --> shows as just the text for lower($$)
expr(toString(Config#lookup($0).Expression)) --> it gives error java.lang.NullPointerException

Thank you

Azure Data Factory
Azure Data Factory
An Azure service for ingesting, preparing, and transforming data at scale.
11,245 questions
{count} votes

Your answer

Answers can be marked as Accepted Answers by the question author, which helps users to know the answer solved the author's problem.