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From "Laljo John Pullokkaran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11927) Implement/Enable constant related optimization rules in Calcite: enable HiveReduceExpressionsRule to fold constants
Date Thu, 26 Nov 2015 03:44:10 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15028102#comment-15028102
] 

Laljo John Pullokkaran commented on HIVE-11927:
-----------------------------------------------

[~pxiong] I looked at the patch:
1. Patch has bunch of print statements
2. ReduceExpressions for filter (select x from r1 where false ) will generate an empty logical
value list (i.e null scan) instead of TS. ASTConverter needs to handle this. I.e translate
"NULL SCAN" to table "dual"

> Implement/Enable constant related optimization rules in Calcite: enable HiveReduceExpressionsRule
to fold constants
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-11927
>                 URL: https://issues.apache.org/jira/browse/HIVE-11927
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-11927.01.patch, HIVE-11927.02.patch, HIVE-11927.03.patch, HIVE-11927.04.patch,
HIVE-11927.05.patch, HIVE-11927.06.patch, HIVE-11927.07.patch, HIVE-11927.08.patch
>
>




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