Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14809
Yeah, that is a bug. We did not get an exception when we read it, but we
can get the error when trying to write it. The error message is confusing
```
Can only write data to relations with a single path.;
org.apache.spark.sql.AnalysisException: Can only write data to relations
with a single path.;
at
org.apache.spark.sql.execution.datasources.DataSourceAnalysis$$anonfun$apply$1.applyOrElse(DataSourceStrategy.scala:167)
```
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