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https://issues.apache.org/jira/browse/HIVE-4568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Carl Steinbach updated HIVE-4568:
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Status: Open (was: Patch Available)
Currently HiveServer2 (and by extension Beeline) supports the ability to
interactively set hivevars, system properties, and configuration properties on
a per-session basis, and also supports the ability to inspect these values,
along with environment variable values. All of this functionality is provided
through the 'set' command and is implemented on the server-side. HiveServer2
doesn't support variable interpolation, but it should. The problem with the
approach outlined in this patch is that it masks the session variables stored
on the server side, and instead maintains additional variable state on the
client side. This is especially confusing because users can still see and
modify the server-side session state using the set command.
I have two high-level pieces of advice:
* Implement variable substitution on the server-side instead of trying to fix
this on the client side. The current approach will result in confusion for
users ("The 'set' command shows me that x=y, but when I use it in a statement I
get an error saying it's not set?"). The patch also doesn't support hivevars,
and doesn't support the ability to inspect variable values using the 'set'
command. All of this functionality already exists on the server-side, so why
not take advantage of it?
* If the actual goal of this patch is to provide access to client-side state as
opposed to server-side state, then I think the syntax should be different in
order to avoid confusion, e.g. @@var@@ instead of ${var}.
> Beeline needs to support resolving variables
> --------------------------------------------
>
> Key: HIVE-4568
> URL: https://issues.apache.org/jira/browse/HIVE-4568
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 0.10.0
> Reporter: Xuefu Zhang
> Assignee: Xuefu Zhang
> Priority: Minor
> Fix For: 0.11.1
>
> Attachments: HIVE-4568.patch
>
>
> Beeline currently doesn't support variable (system, env, etc) substitution as
> hive client does. Supporting this feature will certainly make it more usable.
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