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https://issues.apache.org/jira/browse/HIVE-12616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15046982#comment-15046982
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Xuefu Zhang commented on HIVE-12616:
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[~nemon], thanks for reporting and investigating the problem. I believe that
the value for spark.master is null if it's not set explicitly, so comes the
error. The proposed fix seems fine, but I'm afraid other problems will arise if
this NPE is fixed. Thus, I think it would be better if we can add some
validation, making sure spark.master is specified. Would you be interested in
providing a fix? Thanks.
> NullPointerException when spark session is reused to run a mapjoin
> ------------------------------------------------------------------
>
> Key: HIVE-12616
> URL: https://issues.apache.org/jira/browse/HIVE-12616
> Project: Hive
> Issue Type: Bug
> Components: Spark
> Affects Versions: 1.3.0
> Reporter: Nemon Lou
> Assignee: Xuefu Zhang
>
> The way to reproduce:
> {noformat}
> set hive.execution.engine=spark;
> create table if not exists test(id int);
> create table if not exists test1(id int);
> insert into test values(1);
> insert into test1 values(1);
> select max(a.id) from test a ,test1 b
> where a.id = b.id;
> {noformat}
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