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https://issues.apache.org/jira/browse/HBASE-21158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16609923#comment-16609923
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Andrew Purtell commented on HBASE-21158:
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+1 from me
> Empty qualifier cell is always returned when using QualifierFilter
> ------------------------------------------------------------------
>
> Key: HBASE-21158
> URL: https://issues.apache.org/jira/browse/HBASE-21158
> Project: HBase
> Issue Type: Bug
> Components: Filters
> Affects Versions: 3.0.0, 2.2.0
> Reporter: Guangxu Cheng
> Assignee: Guangxu Cheng
> Priority: Major
> Attachments: HBASE-21158.master.001.patch,
> HBASE-21158.master.002.patch, HBASE-21158.master.003.patch,
> HBASE-21158.master.004.patch
>
>
> {code:xml}
> hbase(main):002:0> put 'testTable','testrow','f:testcol1','testvalue1'
> 0 row(s) in 0.0040 seconds
> hbase(main):003:0> put 'testTable','testrow','f:','testvalue2'
> 0 row(s) in 0.0070 seconds
> # get row with empty column f:, result is correct.
> hbase(main):004:0> scan 'testTable',{FILTER => "QualifierFilter (=,
> 'binary:')"}
> ROW COLUMN+CELL
>
>
> testrow column=f:,
> timestamp=1536218563581, value=testvalue2
>
> 1 row(s) in 0.0460 seconds
> # get row with column f:testcol1, result is incorrect.
> hbase(main):005:0> scan 'testTable',{FILTER => "QualifierFilter (=,
> 'binary:testcol1')"}
> ROW COLUMN+CELL
>
>
> testrow column=f:,
> timestamp=1536218563581, value=testvalue2
>
> testrow column=f:testcol1,
> timestamp=1536218550827, value=testvalue1
>
> 1 row(s) in 0.0070 seconds
> {code}
> As the above operation, when the row contains empty qualifier column, empty
> qualifier cell is always returned when using QualifierFilter.
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