danny0405 commented on a change in pull request #1529: [CALCITE-3442] In
ElasticSearch adapter, set `stored_fields = _none_` to prohibit FetchPhase get
involved
URL: https://github.com/apache/calcite/pull/1529#discussion_r339456078
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File path:
elasticsearch/src/main/java/org/apache/calcite/adapter/elasticsearch/ElasticsearchTable.java
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@@ -186,6 +186,11 @@ String scriptedFieldPrefix() {
query.put("_source", false);
query.put("size", 0);
query.remove("script_fields");
+ // set _source = false and size = 0, `FetchPhase` would still be executed
+ // to fetch the metadata fields and visit the Lucene stored_fields,
+ // which would lead to performance declined dramatically.
+ // `stored_fields = _none` can prohibit such behavior entirely
+ query.put("stored_fields", "_none_");
Review comment:
Cool, thanks for the explanation ~
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