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https://issues.apache.org/jira/browse/HBASE-5082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175587#comment-13175587
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Gary Helmling commented on HBASE-5082:
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ColumnAggregationEndpoint is a test class that was created for use by
TestClassLoading. As far as I'm aware, it wasn't intended to be a user-facing
class or utility. For that case you would want to use the
AggregateProtocol/AggregateImplementation coprocessor.
Maybe it would be better to just change ColumnAggregationEndpoint to default
(package-private) visibility so that it's clear people should not try to make
use of it?
> ColumnAggregationEndPoint- Causes null pointer in RS when we pass null column
> qualifier
> ---------------------------------------------------------------------------------------
>
> Key: HBASE-5082
> URL: https://issues.apache.org/jira/browse/HBASE-5082
> Project: HBase
> Issue Type: Bug
> Reporter: ramkrishna.s.vasudevan
> Priority: Minor
>
> I was trying to use the ColumnAggregationEndPoint.sum().
>
> In my sample is just created a column family but did not use any qualifier
> and inserted some data.
>
> I tried to use ColumnAggregationEndPoint.sum(qualifier, null). When i did
> this inside the ColumnAggregationEndPoint we do
> scan.addColumn(). This is adding the [null] array in the scan object. Later
> in the scanQueryMatcher it is throwing nullpointer exception.
> I can understand that addColumn() is to specifiy the qualifier.
> Do we need to document somewhere saying qualifier should not be null? I think
> coprocessors can be used even in places where we don't have qualifiers. If
> that is the case this sample ColumnAggregationEndPoint may not work.
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