Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/18953
The Jenkins fails twice with different R test suite.s Those errors are
irrelevant.
- test_mllib_tree.R (Test build #80875)
```
1. Error: spark.gbt (@test_mllib_tree.R#120)
-----------------------------------
java.lang.IllegalArgumentException: requirement failed: The input column
stridx_f91a4b086385 should have at least two distinct values.
```
- test_mllib_classification.R (Test build #80877)
```
1. Error: spark.svmLinear (@test_mllib_classification.R#80)
--------------------
java.lang.IllegalArgumentException: requirement failed: LinearSVC only
supports binary classification. 1 classes detected in
linearsvc_ec743395c7af__labelCol
```
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