[Java] getMinorTypeForArrowType returns sparse minor type for dense union types

[asfimport]

Reporter: David Li / @lidavidm
Assignee: David Li / @lidavidm

Related issues:

• [Python, Java] UnionArray round trip not working (duplicates)

_{Note: This issue was originally created as ARROW-9284. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
@lidavidm are you still going to look at this?

[asfimport]

David Li / @lidavidm:
Sorry - this is superceded by ARROW-1692 as Ryan had the same fix there, will cancel.