Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4937#issuecomment-96081013
This is a cool feature, but I'm not sure Spark needs its own in-house
expression language. It seems like it belongs in, for example, the Typesafe
Config project that Spark uses, or an adjunct to that project. This does
introduce some tricky cases: when can what types of props expect to reference
values from which sources? already a dark and tricky corner of the project. I
feel like this may not add enough value to justify the overhead, which is not
any comment on the quality of the idea, language or execution.
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