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https://issues.apache.org/jira/browse/PIG-3628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13849333#comment-13849333
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Jochem van Grondelle commented on PIG-3628:
-------------------------------------------
Workaround: store hbs4 in temp file and then load this temp file again with
PigLoader.
> When using UNION with 2 HbaseStorages, casting to chararray results in empty
> string
> -----------------------------------------------------------------------------------
>
> Key: PIG-3628
> URL: https://issues.apache.org/jira/browse/PIG-3628
> Project: Pig
> Issue Type: Bug
> Components: parser
> Affects Versions: 0.11
> Environment: CDH5, Centos 6
> Reporter: Jochem van Grondelle
> Priority: Minor
>
> Hi,
> We stumbled upon the following issue. I am wondering if anyone can help us
> with it. I am available for any follow up questions. Unfortunately, I am not
> a Java programmer, so I cannot supply a fix if this actually is a bug.
> It seems that the following issue is specific to the HbaseLoader, but I am
> not sure. When using any other loaders (two times PigStorage), the problem
> doesn't exist.
> It seems that even when we specifiy 'content:map [ chararray ] ' when loading
> data from HBase, and Pig is saying the schema contains chararrays, still
> maybe in the background those fields are bytearrays that seem to be not
> convertable.
> First create 2 Hbase tables:
> {code}
> --hbase shell
> --
> --hbase(main):001:0> create 'test_table1','f'
> --0 row(s) in 20.0530 seconds
> --
> --hbase(main):002:0> create 'test_table2', 'f'
> --0 row(s) in 1.4420 seconds
> --
> --hbase(main):008:0> put
> 'test_table1','1-1386066912072','f:date_created','2012-01-04T11:33:59:05321'
> --0 row(s) in 5.3380 seconds
> --
> --hbase(main):002:0> put
> 'test_table2','2-1386066912074','f:date_created','2012-01-04T11:33:59:05321'
> --0 row(s) in 0.0540 seconds
> --
> --
> --hbase(main):003:0> quit
> {code}
> -- Then run the following Pig script:
> {code}
> hbs1 = LOAD 'hbase://test_table1'
> USING org.apache.pig.backend.hadoop.hbase.HBaseStorage(
> 'f:*','-loadKey true')
> AS ( id:bytearray, content:map[chararray]);
>
> hbs2 = LOAD 'hbase://test_table2'
> USING org.apache.pig.backend.hadoop.hbase.HBaseStorage(
> 'f:*','-loadKey true')
> AS ( id:bytearray, content:map[chararray]);
> hbs3 = UNION hbs1, hbs2;
> hbs4 = FOREACH hbs3
> GENERATE id as hbase_id
> , flatten(content#'date_created') as date_created
>
> ;
> hbs5 = FOREACH hbs4
> GENERATE hbase_id
> , date_created --without (chararray)
> , SUBSTRING( date_created,1,10) as date_created_trunc
>
> ;
>
> DUMP hbs5;
> {code}
> *Result*
> {code}
> (2-1386066912074,2012-01-04T11:33:59:05321,)
> (1-1386066912072,2012-01-04T11:33:59:05321,)
> {code}
> *Expected result*
> {code}
> (2-1386066912074,2012-01-04T11:33:59:05321,2012-01-04)
> (1-1386066912072,2012-01-04T11:33:59:05321,2012-01-04)
> {code}
> The Substring function in combination with the date_created is just for
> example purposes. There are several String functions that we want to be able
> to use.
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