[ 
https://issues.apache.org/jira/browse/HIVE-19446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466555#comment-16466555
 ] 

Gopal V commented on HIVE-19446:
--------------------------------

Lookups that happen too early are triggering this NPE.

{code}
Caused by: java.lang.NullPointerException
    at 
org.apache.hadoop.hive.ql.cache.results.QueryResultsCache.entryMatches(QueryResultsCache.java:705)
 ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
    at 
org.apache.hadoop.hive.ql.cache.results.QueryResultsCache.lookup(QueryResultsCache.java:442)
 ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
    at 
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.checkResultsCache(SemanticAnalyzer.java:14703)
 ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
    at 
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:12060)
 ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
    at 
org.apache.hadoop.hive.ql.parse.CalcitePlanner.analyzeInternal(CalcitePlanner.java:334)
 ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
    at 
org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:288)
 ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
Show more
{code}

> QueryCache: Transaction lists needed for pending cache entries
> --------------------------------------------------------------
>
>                 Key: HIVE-19446
>                 URL: https://issues.apache.org/jira/browse/HIVE-19446
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Gopal V
>            Assignee: Jason Dere
>            Priority: Major
>
> Hive query-cache needs a transactional list, even when the entry is pending 
> state so that other identical queries with the same transactional state can 
> wait for the first query to complete, instead of triggering their own 
> instance.



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