Github user frreiss commented on the pull request:
https://github.com/apache/spark/pull/11184#issuecomment-193530307
This change adds a new attribute `prettyDataType` to about two dozen
different classes. The new attribute is populated with code that is mostly
copied and pasted from the code to set the existing `dataType` attribute. The
copied code has been modified to set all "nullable" attributes in nested types
to TRUE. As far as I can see, the `prettyDataType` attribute is only used in
one place.
It would be cleaner to compute `prettyDataType` in a single function by
walking a visitor over the tree stored in the `dataType` field.
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