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Date: Wed, 1 Feb 2017 16:39:51 +0000 (UTC)
From: "Till (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (ASTERIXDB-1779) Processing the certain function
 predicates after a simple predicates
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archived-at: Wed, 01 Feb 2017 16:39:55 -0000


    [ https://issues.apache.org/jira/browse/ASTERIXDB-1779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15848597#comment-15848597 ] 

Till commented on ASTERIXDB-1779:
---------------------------------

I think that the and-evaluator stops evaluating after getting the first "false". If so, the predicates are ordered by increasing evaluation cost, this should already happen.
Do you see an issue with the example query?

> Processing the certain function predicates after a simple predicates
> --------------------------------------------------------------------
>
>                 Key: ASTERIXDB-1779
>                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-1779
>             Project: Apache AsterixDB
>          Issue Type: Improvement
>            Reporter: Taewoo Kim
>
> For example, if we have the following AQL query,
> {code}
> for $i in dataset MyData
>    where $i.id < 5 and edit-distance($i.name, "Arnold") < 2
>    return $i;
> {code}
> It may be better to process *$i.id < 5* predicate first and then process *edit-distance($i.name, "Arnold")* predicate since the processing cost of the latter is higher than that of the former.  


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