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https://issues.apache.org/jira/browse/HIVE-1546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12905640#action_12905640
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Ashutosh Chauhan commented on HIVE-1546:
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@Carl,
* Ya, the main motivating use case is to provide an alternate DDL CLI tool
(hopefully not crippled *smiles*). Reason for that is to enforce certain
use-cases on DDL commands in Howl CLI. More details on that are here:
http://wiki.apache.org/pig/Howl/HowlCliFuncSpec If you have questions why we
are making such decisions in Howl, I will encourage you to post it on howl-dev
list and we can discuss it there. howl...@yahoogroups.com
* I dont understand what do you mean by making "SemanticAnalyzer a public API".
This patch is just letting other tools to do some semantic analysis of the
query and then use Hive to do further processing (if tool chooses to do so).
Important point here is *other tools*. This in no way enforcing any changes to
any Hive behavior. Hive can continue to have its own semantic analyzer and do
any sort of semantic analysis of the query. Hive is making no guarantees to any
tool.
* Hive doesnt care about INPUTDRIVER and OUTPUTDRIVER and neither this patch is
asking it to. I dont see any way that its providing any mechanism for defining
tables in MetaStore that Hive cant read or write to.
@John,
Do you want to make me to any further changes or are we good to go?
> Ability to plug custom Semantic Analyzers for Hive Grammar
> ----------------------------------------------------------
>
> Key: HIVE-1546
> URL: https://issues.apache.org/jira/browse/HIVE-1546
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Metastore
> Affects Versions: 0.7.0
> Reporter: Ashutosh Chauhan
> Assignee: Ashutosh Chauhan
> Fix For: 0.7.0
>
> Attachments: hive-1546-3.patch, hive-1546-4.patch, hive-1546.patch,
> hive-1546_2.patch
>
>
> It will be useful if Semantic Analysis phase is made pluggable such that
> other projects can do custom analysis of hive queries before doing metastore
> operations on them.
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