[
https://issues.apache.org/jira/browse/HIVE-1070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
John Sichi reassigned HIVE-1070:
--------------------------------
Assignee: John Sichi (was: Vikram Chandrasekhar)
> CREATE VIEW followup: add support for column-aliasing on subselect and use
> it when storing view definition with column renaming
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-1070
> URL: https://issues.apache.org/jira/browse/HIVE-1070
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 0.6.0
> Reporter: John Sichi
> Assignee: John Sichi
> Fix For: 0.6.0
>
>
> Copied from the original comment:
> If you do CREATE VIEW v(x,y) AS SELECT a+1,b+2 FROM t
> then we'll store the expanded view def as SELECT `_c0` AS `x`,`_c1` AS `y`
> FROM (SELECT `t`.`a`+1,`t`.`b`+2 FROM `t`) `v`
> As a result, if hive ever changes its convention for generating anonymous
> expression names (_c0, _c1, ...), such stored view definitions will break.
> The only way I can think of to avoid this is to implement SQL:200n's
> column-alias-by-position construct , e.g.
> (SELECT `t`.`a`+1,`t`.`b`+2 FROM `t`) AS `v`(`x`,`y`)
> (similar to what was done for LATERAL VIEW).
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
