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  1. Calcite
  2. CALCITE-3442

In ElasticSearch adapter, set `stored_fields = _none_` to prohibit FetchPhase get involved

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      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.

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              • Assignee:
                danny0405 Danny Chen
                Reporter:
                yunfeng,wu yunfeng
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