Github user srowen commented on the issue:
https://github.com/apache/spark/pull/20574
This seems like a simple nice-to-have, but opens up a lot of questions.
What is the SPI contract between Spark and these tabs? I am not sure it's worth
it. What's an example of something that must be in a custom tab and not in your
user code? I find these requests usually come in as a workaround for some other
concern outside Spark.
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