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https://issues.apache.org/jira/browse/SOLR-2444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016107#comment-13016107
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Yonik Seeley commented on SOLR-2444:
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bq. no need for the '_' with transformers – i would hope that the brackets tell
you that it is a tranformer.
Right, but it seems like the name of the transformer should match the field
that it adds to the document by default? That's just a convention of course...
for example, fl=_docid_ adds the _docid_ field to the documents. It seems
natural to refer to the transformer that does that as the _docid_ transformer?
bq. I still don't get this. How do you know that the literal is not referring
to a field (or invalid field)? How do you know it is an int vs float vs double
vs string? Seems like too much magic to me.
It's magic people expect, and easy to understand, because most of their
programming languages work that way. It's unlikely that float vs double would
matter for returning a constant anyway - and things like JSON don't even
distinguish. A string would be quoted, and an int would lack characteristics
of a float/doube.
We could even add float() int() double() long() functions in the future if we
really need them.
> Update fl syntax to support: pseudo fields, AS, transformers, and wildcards
> ---------------------------------------------------------------------------
>
> Key: SOLR-2444
> URL: https://issues.apache.org/jira/browse/SOLR-2444
> Project: Solr
> Issue Type: New Feature
> Reporter: Ryan McKinley
> Attachments: SOLR-2444-fl-parsing.patch, SOLR-2444-fl-parsing.patch
>
>
> The ReturnFields parsing needs to be improved. It should also support
> wildcards
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