[DRILL-862] Select against hbase tables with empty number values fails

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Invalid
• Fix Version/s: 0.5.0
• Component/s: Storage - HBase
• Assignee: Suresh Ollala
• Reporter: Krystal
• Created: 29/May/14 22:50
• Updated: 12/Aug/14 16:07
• Resolved: 12/Aug/14 16:07

Description

git.commit.id.abbrev=01bf849

I have a hbase table that contains empty values for some columns/rows. This was due to importing data from a file into hbase. For example a get of a row containing empty age value in hbase:
hbase(main):003:0> get 'voterspaces', '17'
COLUMN CELL
fourcf:create_date timestamp=1401380832939, value=2014-06-04 06:49:06
onecf:name timestamp=1401380832939, value=alice garcia
threecf:contributions timestamp=1401380832939, value=468.51
threecf:voterzone timestamp=1401380832939, value=18555
twocf:age timestamp=1401380832939, value=
twocf:registration timestamp=1401380832939, value=republican

The following query from drill fails due to empty values instead of null:
select cast(row_key as integer) voter_id, convert_from(onecf['name'], 'UTF8') name, cast(twocf['age'] as integer) age, cast(twocf['registration'] as varchar(20)) registration, cast(threecf['contributions'] as decimal(6,2)) contributions, cast(threecf['voterzone'] as integer) voterzone,cast(fourcf['create_date'] as timestamp) create_date from voterspaces where row_key < 20;

message: "Failure while running fragment. < NumberFormatException:[ ]"

From hive, running the same query against a hive table that is mapped to the same hbase table succeeded. If this how it expected to work in drill, then we should to document it.