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From "Ashutosh Chauhan (JIRA)" <>
Subject [jira] [Commented] (HIVE-9140) Add ReduceExpressionRules from Calcite into Hive
Date Wed, 17 Dec 2014 17:39:14 GMT


Ashutosh Chauhan commented on HIVE-9140:

[~jpullokkaran] Can you take a look at this one? I initially thought its better to have it
in applyPreCBOTransformations() but than I realized that our join ordering algorithm leaves
{where true} predicates while optimizing tree. Since, it will be good to remove such predicates,
I have added these rules alongwith join ordering rules.  Let me know what do you think.

> Add ReduceExpressionRules from Calcite into Hive
> ------------------------------------------------
>                 Key: HIVE-9140
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO, Logical Optimizer
>    Affects Versions: 0.14.0
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>         Attachments: HIVE-9140.patch
> These rules provide a form of constant folding.

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