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https://issues.apache.org/jira/browse/CALCITE-3442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16958631#comment-16958631
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yunfeng edited comment on CALCITE-3442 at 10/24/19 7:46 AM:
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I do not know whether this can result in other problem, maybe this can work
just only have count\(*\) 、metric aggregation and do not need the origin
document fields
was (Author: yunfeng,wu):
I do not know whether this can result in other problem, maybe this can work
just only have count(*) 、metric aggregation and do not need the origin
document fields
> Set `stored_fields = _none` prohibit `FetchPhase` get be involved and improve
> the performance for Elasticsearch
> ---------------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-3442
> URL: https://issues.apache.org/jira/browse/CALCITE-3442
> Project: Calcite
> Issue Type: Improvement
> Components: elasticsearch-adapter
> Reporter: yunfeng
> Priority: Major
> Labels: performance, pull-request-available
> Fix For: next
>
> Attachments: elasticsearch-adapter.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> For elasticsearch-adapter, when ElasticsearchAggregate involved , set
> _source = false and size = 0 , Elasticsearch `FetchPhase` would still be
> executed against the current search process and visit the Lucene
> stored_fields, which would lead to performance declined dramatically.
> We can set `stored_fields = _none` prohibit this such behavior completely
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