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From Raphaël Tournoy <raphael.tour...@ccsd.cnrs.fr>
Subject Re: Choosing order of fields in response with fl=field_1, field_2
Date Wed, 29 Apr 2015 21:50:58 GMT
Fair enough, I like the underlying phylosophy and i'm glad to understand 
the choices.
Thank you very much for these explanations,
Raphaël

Le 28/04/2015 19:19, Chris Hostetter a écrit :
>
> because of th enature of the CSV format, the order of the fields *has* to
> be deterministic and consistent for all documents, so the response writer
> sorts them into the approrpaite columns.
>
> for JSON & XML formats this consistency isn't required, so instead Solr
> writes out hte fields of each document in the order they were found in the
> index because it's the fastest & most efficient for solr to return the
> data -- no extra sorting required.
>
> Many decisions about what features live in solr follow the principle of
> "what can we do more efficiently then the client" ... simple things like
> result set sorting & pagination, faceting & highlighting are much more
> efficient to do server side using the underlying lucene index then if
> solrjust shipped all the data across the wire and left it up to the
> client, but something like "make the order of fields consistent for each
> doc in the response" is just as fast/efficient for the client to do as if
> it was done on the server side.
>
> (which is not to say that such a feature would not be possible to
> implement server side, or that any one would have a phiolosophical
> objection to commiting a patch that added an option like this ... i'm just
> trying to explain why something like this has never been a priority)
>
>
>
>
> : Date: Tue, 28 Apr 2015 17:06:02 +0200
> : From: Raphaël Tournoy <raphael.tournoy@ccsd.cnrs.fr>
> : Reply-To: solr-user@lucene.apache.org
> : To: solr-user@lucene.apache.org
> : Subject: Choosing order of fields in response with fl=field_1, field_2
> :
> : Hi Everyone,
> :
> : if add fl=field_1, field_2 in a query the order of fields in the response is
> : good for my needs :
> :
> : {
> : 	field_1 : value X,
> : 	field_2 : value Y
> : }
> :
> : *however* it works only with the CSV reponse format :-(
> :
> : How do i get the same functionnality with for instance XML and JSON reponse
> : format ?
> :
> : with wt=json or wt=xml i get fields in the order they are indexed
> :
> : Why does it only work with CSV response format ?
> :
> :
> : thank you,
> :
> : --
> : Raphaël
> :
> :
>
> -Hoss
> http://www.lucidworks.com/


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