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https://issues.apache.org/jira/browse/COUCHDB-2824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14904155#comment-14904155
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Adam Kocoloski commented on COUCHDB-2824:
-----------------------------------------
My preference would be to have `group_level` override `group` (regardless of
parameter ordering, of course) rather than return a 400.
> group & group_level view parameters override each
> -------------------------------------------------
>
> Key: COUCHDB-2824
> URL: https://issues.apache.org/jira/browse/COUCHDB-2824
> Project: CouchDB
> Issue Type: Bug
> Security Level: public(Regular issues)
> Components: Database Core, HTTP Interface
> Reporter: Nick Vatamaniuc
>
> In a view query, if both group and group_level is specified the last one
> specified overrides any of the previous "group" or "group_level" parameters.
> Example:
> Create a db (db1), at least one document, a design doc (des1) that looks like:
> {code:javascript}
> {
> "views": {
> "v1" : { "map": "function(d){
> emit([1,1],1);
> emit([1,1],10);
> emit([1,2],100);
> emit([1,2],1000);
> emit([2,2],10000);
> }" ,
> "reduce":"_sum"
> }
> }
> {code}
> Then these queries show the problem:
> {code}
> $ http "$DB1/db1/_design/des1/_view/v1?group_level=1&group=true"
> {"rows":[
> {"key":[1,1],"value":11},
> {"key":[1,2],"value":1100},
> {"key":[2,2],"value":10000}
> ]}
> {code}
> But users might expect group_level=1 results to show or a 400 request invalid.
> Specifying group_level=1 after group=true make group_level=1 take effect:
> {code}
> $ http "$DB1/db1/_design/des1/_view/v1?group_level=1&group=true&group_level=1"
> {"rows":[
> {"key":[1],"value":1111},
> {"key":[2],"value":10000}
> ]}
> {code}
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