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https://issues.apache.org/jira/browse/SOLR-3916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470703#comment-13470703
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Hoss Man commented on SOLR-3916:
--------------------------------
bq. In the context of grabbing defaults from XML, we should consider trimming
whitespace in the process of generating those defaults (rather than later).
...which can be pursued in another issue if you wish to do so.
as i've already said: this current bug is _not_ specific to getting defaults
from the xml file, nor is it specific to leading/trailing whitespace that could
be easily trimmed in a generic way. Having a tab or newline or any whitespace
character other then a simple ' ' between the names of fields in an "fl" string
causes this annoying little bug -- regardless of whether it comes from xml
config, or a remote client.
If you look at the patch, you can see my point quite easily: when parsing the
fl, ReturnFields is naively only treating the ' ' character as whitespace and
not recognizing any other whitespace characters that might exist between field
names.
> fl parsing is sensitive to newlines at the end of field names
> -------------------------------------------------------------
>
> Key: SOLR-3916
> URL: https://issues.apache.org/jira/browse/SOLR-3916
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.0-BETA
> Reporter: Hoss Man
> Assignee: Hoss Man
> Fix For: 4.0
>
> Attachments: SOLR-3916.patch
>
>
> As reported by giovanni.bricconi on the user list, there is a bug in "fl"
> parsing that causes solr to get confused when a field name is followed by a
> newline character -- eg: in a requestHandler default like...
> {noformat}
> <!-- newlines showing using "$" -->$
> <str name="fl">$
> sku,store_slug$
> </str>$
> {noformat}
> ...this results in solr assuming it should use function parsing to evaluate
> the field name, which can cause missleading errors if the field name can't be
> used in a function (eg: "can not use FieldCache on multivalued field:
> store_slug")
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