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https://issues.apache.org/jira/browse/HIVE-11735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14963337#comment-14963337
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Chetna Chaudhari commented on HIVE-11735:
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[~ashutoshc]: Changes in column aliases and RR are needed, because we use RR
for intermediate tables too. While debugging I have noticed that all predicates
becomes column aliases for intermediate tables. So for my query it was creating
only one column due to toLowerCase(). Please correct if I am wrong.
> Different results when multiple if() functions are used
> --------------------------------------------------------
>
> Key: HIVE-11735
> URL: https://issues.apache.org/jira/browse/HIVE-11735
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.14.0, 1.0.0, 1.1.1, 1.2.1
> Reporter: Chetna Chaudhari
> Assignee: Chetna Chaudhari
> Attachments: HIVE-11735.patch
>
>
> Hive if() udf is returns different results when string equality is used as
> condition, with case change.
> Observation:
> 1) if( name = 'chetna' , 3, 4) and if( name = 'Chetna', 3, 4) both are
> treated as equal.
> 2) The rightmost udf result is pushed to predicates on left side. Leading
> to same result for both the udfs.
> How to reproduce the issue:
> 1) CREATE TABLE `sample`(
> `name` string)
> ROW FORMAT SERDE
> 'org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe'
> STORED AS INPUTFORMAT
> 'org.apache.hadoop.mapred.TextInputFormat'
> OUTPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'
> TBLPROPERTIES (
> 'transient_lastDdlTime'='1425075745');
> 2) insert into table sample values ('chetna');
> 3) select min(if(name = 'chetna', 4, 3)) , min(if(name='Chetna', 4, 3)) from
> sample;
> This will give result :
> 3 3
> Expected result:
> 4 3
> 4) select min(if(name = 'Chetna', 4, 3)) , min(if(name='chetna', 4, 3)) from
> sample;
> This will give result
> 4 4
> Expected result:
> 3 4
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