#10275 - fix NullPointerException

[slessard]

Fix NullPointerException when trying to add the vector's class name to the message for an UnsupportedOperationException.

This PR will handle the case where value is null. This fixes the NullPointerException I reported in issue #10275. Still, I suspect there is a larger issue at play. I suspect there is supposed to be some kind of ArrowVectorAccessor class for accessing null values.

Please see the bug report #10275 for additional context and details

[nastra]

I think it would be good to add a test that reproduces the issue you described in TestParquetVectorizedReads

[slessard]

@nastra I believe the bug I am trying to fix is associated with Arrow readers, not Spark readers. The file in which you requested I add a unit test is specific to Spark. Is there a place I can add an arrow vectorized reader test?

[slessard]

@nastra I've added a new unit test in iceberg/arrow/src/test/java/org/apache/iceberg/arrow/vectorized/ArrowReaderTest.java. I believe / hope this new unit tests satisfies your requirements.

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