Github user yanboliang commented on the issue:

    https://github.com/apache/spark/pull/16548
  
    @holdenk Could you let me know where we meet similar issue in the 
fulltests? AFAIK, we test functions in ```e1071``` only when it was installed 
on that node, like following:
    ```
    if (requireNamespace("e1071", quietly = TRUE)) {
        expect_error(m <- e1071::naiveBayes(Survived ~ ., data = t1), NA)
        expect_equal(as.character(predict(m, t1[1, ])), "Yes")
      }
    ```


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