Varun Thacker created LUCENE-5873:
-------------------------------------

             Summary: AssertionError in ToChildBlockJoinScorer.advance
                 Key: LUCENE-5873
                 URL: https://issues.apache.org/jira/browse/LUCENE-5873
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Varun Thacker
            Priority: Minor


When using ToChildBJQ and searching via IndexSearcher.search(Query query, 
Filter filter, int n) if we provide a filter which matches both parent and 
child documents we get this error 

{noformat}
java.lang.AssertionError
        at 
__randomizedtesting.SeedInfo.seed([C346722DC1E4810C:A08F176AE828FA1D]:0)
        at 
org.apache.lucene.search.join.ToChildBlockJoinQuery$ToChildBlockJoinScorer.advance(ToChildBlockJoinQuery.java:286)
        at 
org.apache.lucene.search.FilteredQuery$LeapFrogScorer.advanceToNextCommonDoc(FilteredQuery.java:274)
        at 
org.apache.lucene.search.FilteredQuery$LeapFrogScorer.nextDoc(FilteredQuery.java:286)
        at 
org.apache.lucene.search.Weight$DefaultBulkScorer.scoreAll(Weight.java:192)
        at 
org.apache.lucene.search.Weight$DefaultBulkScorer.score(Weight.java:163)
        at org.apache.lucene.search.BulkScorer.score(BulkScorer.java:35)
        at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:614)
        at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:483)
        at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:440)
        at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:273)
        at 
org.apache.lucene.search.join.TestBlockJoinValidation.testValidationForToChildBjqWithChildFilterQuery(TestBlockJoinValidation.java:124)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1618)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:827)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:863)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:877)
        at 
org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:110)
        at 
org.apache.lucene.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:50)
        at 
org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:46)
        at 
com.carrotsearch.randomizedtesting.rules.SystemPropertiesInvariantRule$1.evaluate(SystemPropertiesInvariantRule.java:55)
        at 
org.apache.lucene.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:49)
        at 
org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:65)
        at 
org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:48)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:365)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:798)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:458)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:836)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$3.evaluate(RandomizedRunner.java:738)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$4.evaluate(RandomizedRunner.java:772)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:783)
        at 
org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:46)
        at 
org.apache.lucene.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:42)
        at 
com.carrotsearch.randomizedtesting.rules.SystemPropertiesInvariantRule$1.evaluate(SystemPropertiesInvariantRule.java:55)
        at 
com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:39)
        at 
com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:39)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
org.apache.lucene.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:43)
        at 
org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:48)
        at 
org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:65)
        at 
org.apache.lucene.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:55)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:365)
        at java.lang.Thread.run(Thread.java:745)
{noformat}

This was caught by test failures recored in SOLR-6295 . The reason why we send 
a filter is if the user would like to limit the child documents being matched.




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