[Java] AbstractStructVector#getPrimitiveVectors fails to work with complex child vectors

[asfimport]

Currently in AbstractStructVector#getPrimitiveVectors, only struct type child vectors will recursively get primitive vectors, other complex type like ListVector, UnionVector was treated as primitive type and return directly.

For example, Struct(List(Int), Struct(Int, Varchar)) getPrimitiveVectors should return [IntVector, IntVector, VarCharVector] instead of [ListVector, IntVector, VarCharVector]

Reporter: Ji Liu / @tianchen92
Assignee: Ji Liu / @tianchen92

PRs and other links:

• GitHub Pull Request #5031

_{Note: This issue was originally created as ARROW-6160. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 5031
#5031