[SPARK-17773] [Input/Output] Add VoidObjectInspector

[seyfe]

What changes were proposed in this pull request?

Added VoidObjectInspector to the list of PrimitiveObjectInspectors

How was this patch tested?

(Please explain how this patch was tested. E.g. unit tests, integration tests, manual tests)
Executing following query was failing.
select SOME_UDAF*(a.arr)
from (
select Array(null) as arr from dim_one_row
) a

After the fix, I am getting the correct output:
res0: Array[org.apache.spark.sql.Row] = Array([null])

[hvanhovell]

ok to test

[hvanhovell]

@seyfe This seems like a good idea. Could you add a little test to see if this is working?

[SparkQA]

Test build #66290 has finished for PR 15337 at commit 2c18d75.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[seyfe]

@hvanhovell. Thanks for the suggestion.

Updated the HiveInspectorSuite, so 3 tests failed with below error:
org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaVoidObjectInspector@7f485fda (of class org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaVoidObjectInspector) scala.MatchError: org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaVoidObjectInspector@7f485fda (of class org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaVoidObjectInspector)

After applying the fix, all HiveInspectorSuite tests passed.

[SparkQA]

Test build #66299 has finished for PR 15337 at commit ce0174f.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[rxin]

Thanks - merging in master/2.0.

[rxin]

Actually there is a conflict with back porting this into branch-2.0. Do you mind making a pull request against branch-2.0 too?

[seyfe]

Thanks @rxin. I created a PR for branch-2.0.
#15345