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https://issues.apache.org/jira/browse/ASTERIXDB-1779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15848776#comment-15848776
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Till commented on ASTERIXDB-1779:
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I don't think that we have this logic, as we don't really consider cost in the
optimizer.
We have a few heuristics on what's "expensive" and we try to avoid that but
most of the time I think that we leave the choice to the user - e.g. by
allowing them to specify the order of predicates.
> 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
> Assignee: 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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