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https://issues.apache.org/jira/browse/HIVE-1546?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ashutosh Chauhan updated HIVE-1546:
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Attachment: Howl_Semantic_Analysis.txt
@Namit,
As far as I understand, Hooks were designed to run before or after the query
executes, not while query is getting executing. By executing a query I mean
(generating AST, doing semantic analysis of that AST which includes necessary
metadata operations, building a query plan and running the plan). If that was
how hook were intended to be used I am not clear how they will be used in this
scenario. In Howl its not just a list of metadata operations that we want to
allow or disallow, there is a bit more semantic analysis that we do which
includes doing metadata operation on metadata repository. Its not really before
or after query is executed, it is one of the parts of query processing itself.
You also hinted that hooks can be modified and more information can be provided
in those methods. If thats what we do then I think we are loosing semantics on
hooks which is something which is fired before and after the query executes, as
hook will now be running while query is executing. Its entirely possible that I
have misunderstood hooks and their intended usage. You obviously know more then
so feel free to correct me.
I am also attaching what semantic analysis that we are doing for everyone's
reference for better context.
> 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, Howl_Semantic_Analysis.txt
>
>
> 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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