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From "Lianhui Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3472) Build An Analytical SQL Engine for MapReduce
Date Tue, 25 Sep 2012 03:00:09 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13462391#comment-13462391
] 

Lianhui Wang commented on HIVE-3472:
------------------------------------

nexr have done some works in oracle sql to hive sql.
the session's address(from page 18):
http://www.slideshare.net/cloudera/hadoop-world-2011-replacing-rdbdw-with-hadoop-and-hive-for-telco-big-data-jason-han-nexr
i think we should transfer the oracle's syntax tree to hive's syntax tree.that maybe easy.
another thing is directly transfer the oracle's sql to hive query play.but i think that need
more time and works.

                
> Build An Analytical SQL Engine for MapReduce
> --------------------------------------------
>
>                 Key: HIVE-3472
>                 URL: https://issues.apache.org/jira/browse/HIVE-3472
>             Project: Hive
>          Issue Type: New Feature
>    Affects Versions: 0.10.0
>            Reporter: Shengsheng Huang
>         Attachments: SQL-design.pdf
>
>
> While there are continuous efforts in extending Hive’s SQL support (e.g., see some
recent examples such as HIVE-2005 and HIVE-2810), many widely used SQL constructs are still
not supported in HiveQL, such as selecting from multiple tables, subquery in WHERE clauses,
etc.  
> We propose to build a SQL-92 full compatible engine (for MapReduce based analytical query
processing) as an extension to Hive. 
> The SQL frontend will co-exist with the HiveQL frontend; consequently, one can  mix SQL
and HiveQL statements in their queries (switching between HiveQL mode and SQL-92 mode using
a “hive.ql.mode” parameter before each query statement). This way useful Hive extensions
are still accessible to users. 

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