[
https://issues.apache.org/jira/browse/HIVE-7898?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Justin Leet reassigned HIVE-7898:
---------------------------------
Assignee: (was: Justin Leet)
> HCatStorer should ignore namespaces generated by Pig
> ----------------------------------------------------
>
> Key: HIVE-7898
> URL: https://issues.apache.org/jira/browse/HIVE-7898
> Project: Hive
> Issue Type: Improvement
> Components: HCatalog
> Affects Versions: 0.13.1
> Reporter: Justin Leet
> Priority: Minor
> Attachments: HIVE-7898.1.patch
>
>
> Currently, Pig aliases must exactly match the names of HCat columns for
> HCatStorer to be successful. However, several Pig operations prepend a
> namespace to the alias in order to differentiate fields (e.g. after a group
> with field b, you might have A::b). In this case, even if the fields are in
> the right order and the alias without namespace matches, the store will fail
> because it tries to match the long form of the alias, despite the namespace
> being extraneous information in this case. Note that multiple aliases can
> be applied (e.g. A::B::C::d).
> A workaround is possible by doing a
> FOREACH relation GENERATE field1 AS field1, field2 AS field2, etc.
> This quickly becomes tedious and bloated for tables with many fields.
> Changing this would normally require care around columns named, for example,
> `A::b` as has been introduced in Hive 13. However, a different function call
> only validates Pig aliases if they follow the old rules for Hive columns. As
> such, a direct change (rather than attempting to match either the
> namespace::alias or just alias) maintains compatibility for now.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
