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https://issues.apache.org/jira/browse/DRILL-4020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14987857#comment-14987857
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Akihiko Kusanagi commented on DRILL-4020:
-----------------------------------------
Created reviewboard
> The not-equal operator returns incorrect results when used on the HBase row
> key
> -------------------------------------------------------------------------------
>
> Key: DRILL-4020
> URL: https://issues.apache.org/jira/browse/DRILL-4020
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - HBase
> Affects Versions: 1.2.0
> Environment: Drill Sandbox
> Reporter: Akihiko Kusanagi
> Priority: Critical
> Attachments: DRILL-4020.1.patch.txt, DRILL-4020.patch
>
>
> Create a test HBase table:
> {noformat}
> hbase> create 'table', 'f'
> hbase> put 'table', 'row1', 'f:c', 'value1'
> hbase> put 'table', 'row2', 'f:c', 'value2'
> hbase> put 'table', 'row3', 'f:c', 'value3'
> {noformat}
> The table looks like this:
> {noformat}
> 0: jdbc:drill:zk=maprdemo:5181> SELECT CONVERT_FROM(row_key, 'UTF8') FROM
> hbase.`table`;
> +---------+
> | EXPR$0 |
> +---------+
> | row1 |
> | row2 |
> | row3 |
> +---------+
> 1 row selected (4.596 seconds)
> {noformat}
> However, this query returns incorrect results when a not-equal operator is
> used on the row key:
> {noformat}
> 0: jdbc:drill:zk=maprdemo:5181> SELECT CONVERT_FROM(row_key, 'UTF8') FROM
> hbase.`table` WHERE row_key <> 'row1';
> +---------+
> | EXPR$0 |
> +---------+
> | row1 |
> | row2 |
> | row3 |
> +---------+
> 1 row selected (0.573 seconds)
> {noformat}
> In the query plan, there is no RowFilter:
> {noformat}
> 00-00 Screen
> 00-01 Project(EXPR$0=[CONVERT_FROMUTF8($0)])
> 00-02 Scan(groupscan=[HBaseGroupScan [HBaseScanSpec=HBaseScanSpec
> [tableName=table, startRow=, stopRow=, filter=null], columns=[`row_key`]]])
> {noformat}
> When the query has multiple not-equal operators, it works fine:
> {noformat}
> 0: jdbc:drill:zk=maprdemo:5181> SELECT CONVERT_FROM(row_key, 'UTF8') FROM
> hbase.`table` WHERE row_key <> 'row1' AND row_key <> 'row2';
> +---------+
> | EXPR$0 |
> +---------+
> | row3 |
> +---------+
> 1 row selected (0.255 seconds)
> {noformat}
> In the query plan, a FilterList has two RowFilters with NOT_EQUAL operators:
> {noformat}
> 00-00 Screen
> 00-01 Project(EXPR$0=[CONVERT_FROMUTF8($0)])
> 00-02 Scan(groupscan=[HBaseGroupScan [HBaseScanSpec=HBaseScanSpec
> [tableName=table, startRow=, stopRow=, filter=FilterList AND (2/2):
> [RowFilter (NOT_EQUAL, row1), RowFilter (NOT_EQUAL, row2)]],
> columns=[`row_key`]]])
> {noformat}
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