Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/15576
Test failure is intentional, it's picking up the following warnings:
```
Warnings
-----------------------------------------------------------------------
1. createDataFrame uses files for large objects (@test_sparkSQL.R#215) -
Use Sepal_Length instead of Sepal.Length as column name
2. createDataFrame uses files for large objects (@test_sparkSQL.R#215) -
Use Sepal_Width instead of Sepal.Width as column name
3. createDataFrame uses files for large objects (@test_sparkSQL.R#215) -
Use Petal_Length instead of Petal.Length as column name
4. createDataFrame uses files for large objects (@test_sparkSQL.R#215) -
Use Petal_Width instead of Petal.Width as column name
```
Which is fixed in PR #15560
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