Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/19001
The R failure looks irrelevant.
```
1. Error: spark.logit (@test_mllib_classification.R#288)
-----------------------
java.lang.IllegalArgumentException: requirement failed: The input column
stridx_c3082b343085 should have at least two distinct values.
```
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