EnricoMi commented on PR #36150:
URL: https://github.com/apache/spark/pull/36150#issuecomment-1097866590
@awdavidson the `stack` approach allows for the most concise implementation
of `melt` / `unpivot`. Thanks for sharing! But every user of Spark has to come
up with an implementation, understand it, test it.
As a side note: Since `stack` is only accessible through `expr("...")`,
implementations of that approach are likely to introduce SQL injection
vulnerabilities.
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