[jira] [Created] (SOLR-9048) {!parent } {!child } throws NPE if underneath query parser yields no clauses

[Mikhail Khludnev (JIRA)]

Mikhail Khludnev created SOLR-9048:
--------------------------------------

             Summary: {!parent } {!child } throws NPE if underneath query 
parser yields no clauses 
                 Key: SOLR-9048
                 URL: https://issues.apache.org/jira/browse/SOLR-9048
             Project: Solr
          Issue Type: Bug
          Components: query parsers
         Environment: download solr 6.0 distro 
$bin/solr start -e techproducts

            Reporter: Mikhail Khludnev


if we add a stopword (here it's {{and}}) we can easily break query parsing via
{code}
{!child of=inStock:true}{!field f=title_en v='and'}}}
{code}
{noformat}
 <str name="trace">java.lang.NullPointerException
        at 
org.apache.lucene.search.join.ToChildBlockJoinQuery.hashCode(ToChildBlockJoinQuery.java:360)
        at 
org.apache.solr.search.QueryResultKey.&lt;init&gt;(QueryResultKey.java:46)
        at 
org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1521)
        at 
org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:634)
        at 
org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:529)
{noformat}

{code}
q={!parent which=inStock:true}{!field f=title_en v='and'}
{code}
{noformat}
<str name="trace">java.lang.NullPointerException
        at 
org.apache.lucene.search.join.ToParentBlockJoinQuery.hashCode(ToParentBlockJoinQuery.java:493)
        at org.apache.solr.search.QueryResultKey.<init>(QueryResultKey.java:46)
        at 
org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1521)
        at 
org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:634)
        at 
org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:529)
        at 
{noformat}

however I wonder what's the proper behavior in this cases 



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