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https://issues.apache.org/jira/browse/CALCITE-2689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17446733#comment-17446733
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Julian Hyde commented on CALCITE-2689:
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Thank you!
> ES Adapter. Grouping on date / number fields fails
> --------------------------------------------------
>
> Key: CALCITE-2689
> URL: https://issues.apache.org/jira/browse/CALCITE-2689
> Project: Calcite
> Issue Type: Improvement
> Components: elasticsearch-adapter
> Reporter: Andrei Sereda
> Assignee: Julian Hyde
> Priority: Major
> Fix For: 1.18.0
>
>
> For [Terms
> Aggregation|https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-terms-aggregation.html]
> missing value has to have same type as group key:
> {code:sql}
> select max(amount), date from orders group by date -- date column is of type
> date (in ES)
> {code}
> Currently single (text) key is used {{__MISSING__}} which fails when grouping
> on non-string fields (eg. dates, numbers or booleans).
> When using {{missing}} (value) query converter should consider field type.
> This logic should be reviewed once we migrate to [composite
> aggregations|https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-composite-aggregation.html]
> (available since
> [6.1|https://www.elastic.co/guide/en/elasticsearch/reference/6.1/release-notes-6.1.0.html]
> see PR[26800|https://github.com/elastic/elasticsearch/pull/26800])
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