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Posted to solr-user@lucene.apache.org by ufuk yılmaz <uy...@vivaldi.net.INVALID> on 2020/11/19 00:48:03 UTC
How to use the "eval" streaming expression?
Hey,
Can anyone give me an example on how can eval https://lucene.apache.org/solr/guide/8_4/stream-decorator-reference.html#eval be used?
Docs says it allows to run streaming expressions those created on the fly, but I can’t wrap my head on how an expression can be created on the fly, maybe unless it was stored in a field in Solr?
Best
Sent from Mail for Windows 10
Re: How to use the "eval" streaming expression?
Posted by Joel Bernstein <jo...@gmail.com>.
This blog gets more specific with some of the ideas behind the eval
expression:
https://joelsolr.blogspot.com/2017/04/having-talk-with-solr-using-new-echo.html
Joel Bernstein
http://joelsolr.blogspot.com/
On Thu, Nov 19, 2020 at 12:21 PM Joel Bernstein <jo...@gmail.com> wrote:
> You could have a program that writes a Streaming Expression
> programmatically then use eval to run it. You can also save Streaming
> Expression data structures: tuple, list, array etc... and eval them into
> live streams that can be iterated.
>
>
>
>
> Joel Bernstein
> http://joelsolr.blogspot.com/
>
>
> On Wed, Nov 18, 2020 at 7:49 PM ufuk yılmaz <uy...@vivaldi.net.invalid>
> wrote:
>
>> Hey,
>>
>> Can anyone give me an example on how can eval
>> https://lucene.apache.org/solr/guide/8_4/stream-decorator-reference.html#eval
>> be used?
>>
>> Docs says it allows to run streaming expressions those created on the
>> fly, but I can’t wrap my head on how an expression can be created on the
>> fly, maybe unless it was stored in a field in Solr?
>>
>> Best
>>
>> Sent from Mail for Windows 10
>>
>>
Re: How to use the "eval" streaming expression?
Posted by Joel Bernstein <jo...@gmail.com>.
You could have a program that writes a Streaming Expression
programmatically then use eval to run it. You can also save Streaming
Expression data structures: tuple, list, array etc... and eval them into
live streams that can be iterated.
Joel Bernstein
http://joelsolr.blogspot.com/
On Wed, Nov 18, 2020 at 7:49 PM ufuk yılmaz <uy...@vivaldi.net.invalid>
wrote:
> Hey,
>
> Can anyone give me an example on how can eval
> https://lucene.apache.org/solr/guide/8_4/stream-decorator-reference.html#eval
> be used?
>
> Docs says it allows to run streaming expressions those created on the fly,
> but I can’t wrap my head on how an expression can be created on the fly,
> maybe unless it was stored in a field in Solr?
>
> Best
>
> Sent from Mail for Windows 10
>
>