[HBASE-21158] Empty qualifier cell should not be returned if it does not match QualifierFilter

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha-1, 2.2.0
• Fix Version/s: 3.0.0-alpha-1, 1.3.3, 1.2.8, 2.2.0, 1.4.8, 2.1.1, 2.0.3
• Component/s: Filters
• Hadoop Flags: Incompatible change

Release Note

<!-- markdown -->

Scans that make use of `QualifierFilter` previously would erroneously return both columns with an empty qualifier along with those that matched. After this change that behavior has changed to only return those columns that match.

• Assignee: Guangxu Cheng
• Reporter: Guangxu Cheng
• Created: 06/Sep/18 07:35
• Updated: 28/May/19 19:57
• Resolved: 12/Oct/18 19:35

Description

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

As the above operation, when the row contains empty qualifier column, empty qualifier cell is always returned when using QualifierFilter.

Issue Links

• blocks: HBASE-21174 [REST] Failed to parse empty qualifier in TableResource#getScanResource
• causes: PHOENIX-5303 Fix index failures with some versions of HBase.