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https://issues.apache.org/jira/browse/CALCITE-2755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16729834#comment-16729834
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Andrei Sereda commented on CALCITE-2755:
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Yes that's the plan.
Similar to
[rowid|https://docs.oracle.com/cd/B19306_01/server.102/b14200/pseudocolumns008.htm]
(in Oracle) or
[oid|https://www.postgresql.org/docs/current/ddl-system-columns.html#id-1.5.4.6.4.1.2.1.1]
(in PostgreSQL). Available only when explicitly requested.
> 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
> Priority: Major
> Labels: pull-request-available
>
> 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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