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https://issues.apache.org/jira/browse/SOLR-13182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17426669#comment-17426669
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Sayanti Dey commented on SOLR-13182:
------------------------------------
[~marek.trtik] What is the expected behavior.I have raised a PR
[https://github.com/apache/solr/pull/338]
Solution: The parent query adds an additional boolean query .Only if parent is
present add boolean query or else match all docs.
> NullPointerException due to an invariant violation in
> org/apache/lucene/search/BooleanClause.java[60]
> -----------------------------------------------------------------------------------------------------
>
> Key: SOLR-13182
> URL: https://issues.apache.org/jira/browse/SOLR-13182
> Project: Solr
> Issue Type: Bug
> Affects Versions: main (9.0)
> Environment: h1. Steps to reproduce
> * Use a Linux machine.
> * Build commit {{ea2c8ba}} of Solr as described in the section below.
> * Build the films collection as described below.
> * Start the server using the command {{./bin/solr start -f -p 8983 -s
> /tmp/home}}
> * Request the URL given in the bug description.
> h1. Compiling the server
> {noformat}
> git clone https://github.com/apache/lucene-solr
> cd lucene-solr
> git checkout ea2c8ba
> ant compile
> cd solr
> ant server
> {noformat}
> h1. Building the collection
> We followed [Exercise
> 2|http://lucene.apache.org/solr/guide/7_5/solr-tutorial.html#exercise-2] from
> the [Solr
> Tutorial|http://lucene.apache.org/solr/guide/7_5/solr-tutorial.html]. The
> attached file ({{home.zip}}) gives the contents of folder {{/tmp/home}} that
> you will obtain by following the steps below:
> {noformat}
> mkdir -p /tmp/home
> echo '<?xml version="1.0" encoding="UTF-8" ?><solr></solr>' >
> /tmp/home/solr.xml
> {noformat}
> In one terminal start a Solr instance in foreground:
> {noformat}
> ./bin/solr start -f -p 8983 -s /tmp/home
> {noformat}
> In another terminal, create a collection of movies, with no shards and no
> replication, and initialize it:
> {noformat}
> bin/solr create -c films
> curl -X POST -H 'Content-type:application/json' --data-binary '{"add-field":
> {"name":"name", "type":"text_general", "multiValued":false, "stored":true}}'
> http://localhost:8983/solr/films/schema
> curl -X POST -H 'Content-type:application/json' --data-binary
> '{"add-copy-field" : {"source":"*","dest":"_text_"}}'
> http://localhost:8983/solr/films/schema
> ./bin/post -c films example/films/films.json
> {noformat}
> Reporter: Marek
> Priority: Minor
> Labels: diffblue, newdev
> Attachments: SOLR-13182.patch, home.zip
>
>
> Requesting the following URL causes Solr to return an HTTP 500 error response:
> {noformat}
> http://localhost:8983/solr/films/select?q={!child%20q={}
> {noformat}
> The error response seems to be caused by the following uncaught exception:
> {noformat}
> ERROR (qtp689401025-14) [ x:films] o.a.s.h.RequestHandlerBase
> java.lang.NullPointerException: Query must not be null
> at java.util.Objects.requireNonNull(Objects.java:228)
> at org.apache.lucene.search.BooleanClause.<init>(BooleanClause.java:60)
> at org.apache.lucene.search.BooleanQuery$Builder.add(BooleanQuery.java:127)
> at
> org.apache.solr.search.join.BlockJoinChildQParser.noClausesQuery(BlockJoinChildQParser.java:50)
> at org.apache.solr.search.join.FiltersQParser.parse(FiltersQParser.java:60)
> at org.apache.solr.search.QParser.getQuery(QParser.java:173)
> at
> org.apache.solr.handler.component.QueryComponent.prepare(QueryComponent.java:158)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:272)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2559)
> at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:711)
> at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:516)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:394)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:340)
> [...]
> {noformat}
> In org/apache/solr/search/join/BlockJoinChildQParser.java[47] there is
> computed query variable 'parents', which receives value null from call to
> 'parseParentFilter()'. The null value is then passed to
> 'org.apache.lucene.search.BooleanQuery.Builder.add' method at line 50. That
> method calls the constructor where 'Objects.requireNonNull' failes
> (the exception is thrown).
> The call to 'parseParentFilter()' evaluates to null, because:
> # In org/apache/solr/search/join/BlockJoinParentQParser.java[59] null is
> set to string 'filter' (becase "which" is not in 'localParams' map).
> # The parser 'parentParser' obtained in the next line has member 'qstr' set
> to null, because the 'filter' passed to 'subQuery' is passed as the first
> argument to 'org.apache.solr.search.QParserPlugin.createParser'.
> # Subsequnt call to 'org.apache.solr.search.QParser.getQuery' on the
> 'parentParser' at
> org/apache/solr/search/join/BlockJoinParentQParser.java[61]
> leads to retuning null in 'org.apache.solr.search.LuceneQParser.parse',
> because the queried string 'qstr' is the empty string.
> --------------------------------------
> We found this bug using [Diffblue Microservices
> Testing|https://www.diffblue.com/labs/]. Find more information on this [fuzz
> testing
> campaign|https://www.diffblue.com/blog/2018/12/19/diffblue-microservice-testing-a-sneak-peek-at-our-early-product-and-results].
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