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https://issues.apache.org/jira/browse/HIVE-5825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13945667#comment-13945667
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Doug Sedlak commented on HIVE-5825:
-----------------------------------
Here is a possible instance of this issue, can you run this case to see it is
addressed by this JIRA in Hive 13? Thanks!
Create a standard textual linefeed delimited HDFS file with 1 row and 1
column, with contents like:
FEB
Issue the following DDL against the above data, filling in location [hdfs_path]
appropriately:
CREATE EXTERNAL TABLE `HIVE_5825` ( month VARCHAR(3) ) STORED AS TEXTFILE
LOCATION [hdfs_path]
Issue the following SQL, which fails in Hive 12:
select case when COUNT(*) > COUNT(`month`) then ' ' else MIN(`month`) end from
HIVE_5825
The Hive 12 failure message generated is:
java.sql.SQLException: Error while processing statement: FAILED:
SemanticException [Error 10016]: Line 1:57 Argument type mismatch '`month`':
The expression after ELSE should have the same type as those after THEN:
"string" is expected but "varchar(3)" is found
> Case statement type checking too restrictive for parameterized types
> --------------------------------------------------------------------
>
> Key: HIVE-5825
> URL: https://issues.apache.org/jira/browse/HIVE-5825
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Reporter: Jason Dere
> Assignee: Jason Dere
> Fix For: 0.13.0
>
> Attachments: HIVE-5825.1.patch
>
>
> explain select
> case when (key = '0') then 123.456BD else 0.0BD end
> from src limit 2
> FAILED: SemanticException [Error 10016]: Line 3:44 Argument type mismatch
> '0.0BD': The expression after ELSE should have the same type as those after
> THEN: "decimal(6,3)" is expected but "decimal(1,0)" is found
> The return type checking is too strict and won't allow different decimal
> types to be returned if they are not the exact same type (precision/scale).
> There are similar issues with char/varchar length, but even in the general
> case it seems odd that you wouldn't be able to specify 1 and 0.0 in the same
> case statement.
> I would propose setting returnOIResolver so that it is able to convert the
> return values to common type.
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