[CALCITE-3442] In ElasticSearch adapter, set `stored_fields = _none_` to prohibit FetchPhase get involved - ASF JIRA

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Details

Type: Improvement
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 1.22.0
Component/s: elasticsearch-adapter
Labels:
- performance
- pull-request-available

Flags:

Patch, Important

Description

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 entirely, and skip the Elasticsearch's `fetch phase` which would bring time-consuming `fetch phase` for metadata fields such as '_id' etc.