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https://issues.apache.org/jira/browse/COUCHDB-2226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13972988#comment-13972988
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Nolan Lawson commented on COUCHDB-2226:
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When the keys' lengths are < 999, though, doesn't {{group_level=999}} imply
{{group=true}}? In that example, if you remove the {{keys=...}} part, you get
exactly the same result for {{group_level=999}} and {{group=true}}.
> Wrongful query_parse_error on group_level=999, keys.length > 1
> --------------------------------------------------------------
>
> Key: COUCHDB-2226
> URL: https://issues.apache.org/jira/browse/COUCHDB-2226
> Project: CouchDB
> Issue Type: Bug
> Security Level: public(Regular issues)
> Reporter: Nolan Lawson
>
> It's expected that {{group=true}} will avoid the query parse error if
> keys.length > 1, but since {{group_level=999}} is semantically equivalent to
> {{group=true}}, one would expect that it would also avoid the error.
> However, it doesn't.
> Tested against CouchDB 1.5.0. The script below will repro the error.
> {code}
> DB=http://localhost:5984/mytestdb
> curl -X DELETE $DB
> curl -X PUT $DB
> curl -X PUT $DB/_design/ddoc -H 'content-type:application/json' -d '{"views"
> : {"view" : {"map" : "function (doc){emit(doc._id);}", "reduce" : "_count"}}}'
> curl -X POST $DB/_bulk_docs -H 'content-type:application/json' -d '{"docs" :
> [{"_id" : "1"}, {"_id" : "2"}]}'
> # returns 2 results
> curl -g "$DB/_design/ddoc/_view/view?group=true&keys=[%221%22,%222%22]"
> # throws a query_parse_error
> curl -g "$DB/_design/ddoc/_view/view?group_level=999&keys=[%221%22,%222%22]"
> {code}
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