Github user kevinyu98 commented on the issue:
https://github.com/apache/spark/pull/20795
@viirya yes, my latest submitted code only caching the external functions,
skip the built-in functions.
@WeichenXu123 I will change this comment only
[comment](https://github.com/apache/spark/pull/20795#discussion_r176039913).
Let me know if you have concerns? Thanks.
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