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https://issues.apache.org/jira/browse/HBASE-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13798239#comment-13798239
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Aditya Kishore commented on HBASE-9747:
---------------------------------------
{code}
public boolean filterRowKey(byte[] buffer, int offset, int length) {
...
=> filterRow = (cmp != 0);
return filterRow;
}
{code}
Because the {{filterRowKey()}} filters a row unless the control reach here ↑.
So it is natural for {{filterRow}} to be {{true}} (initialized and reset for
every row) unless set to {{false}} by \[{{filterRow = (cmp != 0)}}\] while
inspecting a row.
> PrefixFilter with OR condition gives wrong results
> --------------------------------------------------
>
> Key: HBASE-9747
> URL: https://issues.apache.org/jira/browse/HBASE-9747
> Project: HBase
> Issue Type: Bug
> Components: Filters
> Affects Versions: 0.95.2, 0.94.9
> Reporter: Deepa Remesh
> Assignee: Aditya Kishore
> Attachments: HBASE-9747_0.94.patch, HBASE-9747.patch
>
>
> PrefixFilter when used with a SingleColumnValueFilter with an OR condition
> gives wrong results. In below example, each filter when evaluated separately
> gives 1 row each. The OR condition with the two filters gives 3 rows instead
> of 2. Repro below:
> create 't1', 'f1'
> put 't1','a1','f1:q2','111'
> put 't1','b1','f1:q1','112'
> put 't1','c1','f1:q1','113'
> hbase(main):020:0> scan 't1', {FILTER => "PrefixFilter ('b') OR
> SingleColumnValueFilter('f1', 'q1', =, 'binary:113')"}
> ROW COLUMN+CELL
> a1 column=f1:q2,
> timestamp=1381468905492, value=111
> b1 column=f1:q1,
> timestamp=1381468905518, value=112
> c1 column=f1:q1,
> timestamp=1381468905549, value=113
> 3 row(s) in 0.1020 seconds
> hbase(main):021:0> scan 't1', {FILTER => "PrefixFilter ('b')"}
> ROW COLUMN+CELL
> b1 column=f1:q1,
> timestamp=1381468905518, value=112
> 1 row(s) in 0.0150 seconds
> hbase(main):002:0> scan 't1', {FILTER => "SingleColumnValueFilter('f1', 'q1',
> =, 'binary:113')"}
> ROW COLUMN+CELL
> c1 column=f1:q1,
> timestamp=1381469178679, value=113
> 1 row(s) in 0.0140 seconds
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