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https://issues.apache.org/jira/browse/HIVE-8871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15895005#comment-15895005
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Christopher commented on HIVE-8871:
-----------------------------------
A concern that I have is that currently in order to perform an update in a hive
table, one uses NULLs as place holders. Those NULLs are ignored if it is a
preexisting record.
CREATE TABLE hbase_table_emp(id int, name string, role string)
STORED BY 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'
WITH SERDEPROPERTIES ("hbase.columns.mapping" = ":key,cf1:name,cf1:role")
TBLPROPERTIES ("hbase.table.name" = "emp");
insert into hbase_table_emp select 1,'bob', 'admin';
insert into hbase_table_emp select 2,'bobby', 'user';
select * from hbase_table_emp;
insert into hbase_table_emp select 1,null, 'superadmin';
See "bob" remains as "bob"...
> Hive Hbase Integration : Support for NULL value columns
> --------------------------------------------------------
>
> Key: HIVE-8871
> URL: https://issues.apache.org/jira/browse/HIVE-8871
> Project: Hive
> Issue Type: Bug
> Components: HBase Handler
> Affects Versions: 0.10.0
> Reporter: Jasper Knulst
> Labels: features
>
> If you map a Hive column to a Hbase CF where the CF only has qualifiers but
> no values, Hive always outputs ' {} ' for that key. This hides the fact that
> qualifiers do exist within the CF. As soon as you put a single byte (like a
> space) as value you'll get a return like this ' {"20140911"," "} in Hive.
> Since it is a common data modelling technique in Hbase to not use the value
> (and essentially use the qualifier in a CF as value holder) I think it would
> be worthwhile to have some support for this in the Hbase handler.
> A solution could be to show a data structure like CF:qualifier:<NULL> like
> this: {"20140911",""}
> , where '20140911' is the qualifier and NULL value in Hbase are shown as
> empty json strings.
> CREATE EXTERNAL TABLE hb_test (
> userhash string,
> count bigint,
> dates map<string,string>)
> STORED BY 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'
> WITH SERDEPROPERTIES (
> "hbase.columns.mapping" =
> ":key,SUM:COUNT,DATES:",
> "hbase.table.default.storage.type" = "binary"
> )
> TBLPROPERTIES("hbase.table.name" = "test");
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