Github user icexelloss commented on the issue:
https://github.com/apache/spark/pull/20239
`MapVector` is still used in Arrow internal code but it should not be
returned to user directly.
https://github.com/apache/arrow/blob/master/java/vector/src/main/java/org/apache/arrow/vector/types/Types.java#L134
@BryanCutler Do you agree?
I also added a test "non nullable struct" in `ArrowColumnVectorSuite`
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