Github user maropu commented on the pull request:
https://github.com/apache/spark/pull/10928#issuecomment-176517539
I'm not sure how to fix though, there is the idea I have; we just throw an
unsupported exception when this type passed. This is because an array type
actually is unique in postgresql against other databases, so I think only a few
users use array[decimal] in the spark JDBC datasource.
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