Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/12135
@gatorsmile it's a good point about the tests. However this JIRA & PR was
for exposing the multi-column functionality of `approxQuantiles`. The missing
test cases date back to original impl really. I think we should create a new
JIRA for it just to separate out the concerns and make tracking things easier.
@zhengruifeng could you create a JIRA ticket and link your new PR to that
one also?
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