Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/19979
@jkbradley
There're two cases which can use `globalCheckFunction`
- test statistics (such as min/max ) on global transformer output
- get global result array and compare it with hardcoding array values.
If remove `globalCheckFunction`, tests in above cases will be harder to
write. So I prefer to reserve `globalCheckFunction`. What do you think ?
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