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From Joel Bernstein <joels...@gmail.com>
Subject Re: Returning multiple fields in graph streaming expression response documents
Date Fri, 19 Jul 2019 15:26:53 GMT
Try:

fetch(names,
     select(
         nodes(emails,
                     walk="johndoe@apache.org->from",
                     gather="to"),
         node as to_s),
         fl="name",
    on="to_s=email")


According to the docs it looks like you have the fields reversed on the
fetch. If that doesn't work, I'll investigate further.




Joel Bernstein
http://joelsolr.blogspot.com/


On Fri, Jul 19, 2019 at 5:51 AM Ahmed Adel <aa.0x7f@gmail.com> wrote:

> Hi Joel,
>
> Thank you for your thoughts. I tried the fetch function, however, the
> response does not contain "fl" fields of the "fetch" expression. For the
> above example, the modified query is as follows:
>
> fetch(names, select(nodes(emails,
>       walk="johndoe@apache.org->from",
>       gather="to"), node as to_s), fl="name", on="email=to_s")
>
>
> where "names" is a collection that contains two fields representing pairs
> of name and email: ("name", "email")
>
> The response returned is:
>
> { "result-set": { "docs": [ { "to_s": "johndoe@apache.org"
> }, { "to_s": "johnsmith@apache.org"
> },
> ... { "EOF": true, "RESPONSE_TIME": 33 } ] } }
>
> The response should have an additional "name" field in each document
> returned. Any additional thoughts are appreciated.
>
> Best,
> A.
>
> On Thu, Jul 18, 2019 at 6:12 PM Joel Bernstein <joelsolr@gmail.com> wrote:
>
> > Hi Ahmed,
> >
> > Take a look at the fetch
> >
> >
> https://lucene.apache.org/solr/guide/8_0/stream-decorator-reference.html#fetch
> >
> > It probably makes sense to allow more field to be returned from a nodes
> > expression as well.
> >
> > Joel Bernstein
> > http://joelsolr.blogspot.com/
> >
> >
> > On Wed, Jul 17, 2019 at 3:12 AM Ahmed Adel <aa.0x7f@gmail.com> wrote:
> >
> > > Hi,
> > >
> > > Thank you for your reply. Could you give more details on the „join“
> > > operation, such as what the sides of the join and the joining condition
> > > would be in this case?
> > >
> > > Best regards,
> > > A.
> > >
> > > On Tue, Jul 16, 2019 at 2:02 PM markus kalkbrenner <
> > > markus.kalkbrenner@biologis.com> wrote:
> > >
> > > >
> > > >
> > > > You have to perform a „join“ to get more fields.
> > > >
> > > > > Am 16.07.2019 um 13:52 schrieb Ahmed Adel <aa.0x7f@gmail.com>:
> > > > >
> > > > > Hi,
> > > > >
> > > > > How can multiple fields be returned in graph traversal streaming
> > > > expression
> > > > > response documents? For example, the following query:
> > > > >
> > > > > nodes(emails,
> > > > >      walk="johndoe@apache.org->from",
> > > > >      gather="to")
> > > > >
> > > > >
> > > > > returns these documents in the response:
> > > > >
> > > > > {
> > > > >  "result-set": {
> > > > >    "docs": [
> > > > >      {
> > > > >        "node": "slist@campbell.com",
> > > > >        "collection": "emails",
> > > > >        "field": "to",
> > > > >        "level": 1
> > > > >      },
> > > > >      {
> > > > >        "node": "catherine.pernot@enron.com",
> > > > >        "collection": "emails",
> > > > >        "field": "to",
> > > > >        "level": 1
> > > > >      },
> > > > >      {
> > > > >        "node": "airam.arteaga@enron.com",
> > > > >        "collection": "emails",
> > > > >        "field": "to",
> > > > >        "level": 1
> > > > >      },
> > > > >      {
> > > > >        "EOF": true,
> > > > >        "RESPONSE_TIME": 44
> > > > >      }
> > > > >    ]
> > > > >  }
> > > > > }
> > > > >
> > > > > How can the query above be modified to return more document fields,
> > > > > "subject" for example?
> > > > >
> > > > > Best regards,
> > > > >
> > > > > A.
> > > >
> > >
> >
>

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