Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/19294
If `path` could be `null`, [this
line](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/SQLHadoopMapReduceCommitProtocol.scala#L54)
will still fail with the error message like `Can not create a Path from a null
string`.
In our Spark SQL code path, how can `path` be null?
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