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https://issues.apache.org/jira/browse/SOLR-17311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17849415#comment-17849415
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Chatree Srichart commented on SOLR-17311:
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Should it add a field like this?
!add_field.png!
> SortSpectParsing add null field even the sort direction is found
> ----------------------------------------------------------------
>
> Key: SOLR-17311
> URL: https://issues.apache.org/jira/browse/SOLR-17311
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: query
> Affects Versions: 8.11.1
> Reporter: Chatree Srichart
> Priority: Major
> Attachments: add_field.png, null_field_it_set_to_top_vallue.png
>
>
> Why the SortSpectParsing add null field even the sort direction is found.
> When I sort by a child field with a CursorMark:
>
> childfield(groupName_s,\{!parent which='*:* -_nest_path_:*'
> v='_nest_path_:\\/customer'}) asc,id desc
>
> The null value will be set to BytesToStringComparator.setTopValue(value)
> method which will cause this error:
>
> java.lang.NullPointerException: Cannot invoke
> "java.lang.CharSequence.length()" because "text" is null
> at org.apache.lucene.util.BytesRef.<init>(BytesRef.java:84) ~[?:?]
>
> Actually the field can be gotten from:
>
> ((ChildFieldValueSourceParser.BlockJoinSortFieldValueSource) ((FunctionQuery)
> q).getValueSource()).childField
>
> See attached screenshot: null_field_it_set_to_top_vallue.png
>
> Is it a bug?
>
>
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