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[jira] [Created] (CALCITE-2755) expose document _id field when querying ElasticSearch.\


Andrei Sereda created CALCITE-2755:
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             Summary: expose document _id field when querying ElasticSearch.\
                 Key: CALCITE-2755
                 URL: https://issues.apache.org/jira/browse/CALCITE-2755
             Project: Calcite
          Issue Type: Improvement
          Components: elasticsearch-adapter
            Reporter: Andrei Sereda
            Assignee: Julian Hyde


Elastic exposes [_id|https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-id-field.html] field for each document (think unique doc ID).

Expose if it is explicitly listed in projection: 
{code:sql}
select _MAP['_id'], _MAP['foo'] from elastic -- available
select * from elastic -- not available
{code}



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