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https://issues.apache.org/jira/browse/SOLR-13199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17055449#comment-17055449
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David Smiley commented on SOLR-13199:
-------------------------------------
Thanks for bringing this to my attention Munendra.
I disagree with the proposed changes. If parentsFilter.getBitSet returns null,
then we should throw an error that the user didn't supply a parentFilter
matching parent documents. If there are no documents then this particular code
won't even be reached as there are no documents to "transform". Likewise if we
parse the query and get null, the query is in error.
> NPE due to unexpected null return value from QueryBitSetProducer.getBitSet
> --------------------------------------------------------------------------
>
> Key: SOLR-13199
> URL: https://issues.apache.org/jira/browse/SOLR-13199
> Project: Solr
> Issue Type: Bug
> Components: search
> Affects Versions: master (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: Johannes Kloos
> Assignee: Munendra S N
> Priority: Minor
> Labels: diffblue, newdev
> Attachments: SOLR-13199.patch, home.zip
>
>
> Requesting the following URL causes Solr to return an HTTP 500 error response:
> {noformat}
> http://localhost:8983/solr/films/select?fl=[child%20parentFilter=ge]&q=*:*
> {noformat}
> The error response seems to be caused by the following uncaught exception:
> {noformat}
> java.lang.NullPointerException
> at
> org.apache.solr.response.transform.ChildDocTransformer.transform(ChildDocTransformer.java:92)
> at org.apache.solr.response.DocsStreamer.next(DocsStreamer.java:103)
> at org.apache.solr.response.DocsStreamer.next(DocsStreamer.java:1)
> at
> org.apache.solr.response.TextResponseWriter.writeDocuments(TextResponseWriter.java:184)
> at
> org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:136)
> at
> org.apache.solr.common.util.JsonTextWriter.writeNamedListAsMapWithDups(JsonTextWriter.java:386)
> at
> org.apache.solr.common.util.JsonTextWriter.writeNamedList(JsonTextWriter.java:292)
> at org.apache.solr.response.JSONWriter.writeResponse(JSONWriter.java:73)
> {noformat}
> In ChildDocTransformer.transform, we have the following lines:
> {noformat}
> final BitSet segParentsBitSet = parentsFilter.getBitSet(leafReaderContext);
> final int segPrevRootId = segRootId==0? -1:
> segParentsBitSet.prevSetBit(segRootId - 1); // can return -1 and that's okay
> {noformat}
> But getBitSet can return null if the set of DocIds is empty:
> {noformat}
> return docIdSet == DocIdSet.EMPTY ? null : ((BitDocIdSet) docIdSet).bits();
> {noformat}
> We found this bug using [Diffblue Microservices
> Testing|https://www.diffblue.com/labs/?utm_source=solr-br]. 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?utm_source=solr-br].
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