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https://issues.apache.org/jira/browse/HIVE-837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12790277#action_12790277
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Namit Jain commented on HIVE-837:
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You are right, but we need the association between the row and the actual file.
Directory is not good enough.
> virtual column support (filename) in hive
> -----------------------------------------
>
> Key: HIVE-837
> URL: https://issues.apache.org/jira/browse/HIVE-837
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Namit Jain
>
> Copying from some mails:
> I am dumping files into a hive partion on five minute intervals. I am using
> LOAD DATA into a partition.
> weblogs
> web1.00
> web1.05
> web1.10
> ...
> web2.00
> web2.05
> web1.10
> ....
> Things that would be useful..
> Select files from the folder with a regex or exact name
> select * FROM logs where FILENAME LIKE(WEB1*)
> select * FROM LOGS WHERE FILENAME=web2.00
> Also it would be nice to be able to select offsets in a file, this would make
> sense with appends
> select * from logs WHERE FILENAME=web2.00 FROMOFFSET=454644 [TOOFFSET=]
> select
> substr(filename, 4, 7) as class_A,
> substr(filename, 8, 10) as class_B
> count( x ) as cnt
> from FOO
> group by
> substr(filename, 4, 7),
> substr(filename, 8, 10) ;
> Hive should support virtual columns
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