Using Expression Libraries

In this video, learn more about using expression libraries. Typically, Expression Libraries are used to create that environment-agnostic set of pipelines so you can simplify moving code into different environments and easily reset expression libraries without having to affect your ETL code. This works well for account names, static variables that can control S3 buckets, directory pads, and more.
Not only that, expression libraries are also great for creating user-defined functions. Watch to learn more!
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[@car9167]

how can you derive a new field. Something like case when fieldA='Something' then 'B' when fieldA='Something else' then 'C' end as derived_field