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https://issues.apache.org/jira/browse/HIVE-16965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16099115#comment-16099115
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Deepak Jaiswal commented on HIVE-16965:
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[~sershe] Thanks for the comments.
Somehow lost the assert while making the code pretty. Applying all your
comments in a patch coming in shortly.
> SMB join may produce incorrect results
> --------------------------------------
>
> Key: HIVE-16965
> URL: https://issues.apache.org/jira/browse/HIVE-16965
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Deepak Jaiswal
> Attachments: HIVE-16965.1.patch, HIVE-16965.2.patch
>
>
> Running the following on MiniTez
> {noformat}
> set hive.mapred.mode=nonstrict;
> SET hive.vectorized.execution.enabled=true;
> SET hive.exec.orc.default.buffer.size=32768;
> SET hive.exec.orc.default.row.index.stride=1000;
> SET hive.optimize.index.filter=true;
> set hive.fetch.task.conversion=none;
> set hive.exec.dynamic.partition.mode=nonstrict;
> DROP TABLE orc_a;
> DROP TABLE orc_b;
> CREATE TABLE orc_a (id bigint, cdouble double) partitioned by (y int, q
> smallint)
> CLUSTERED BY (id) SORTED BY (id) INTO 2 BUCKETS stored as orc;
> CREATE TABLE orc_b (id bigint, cfloat float)
> CLUSTERED BY (id) SORTED BY (id) INTO 2 BUCKETS stored as orc;
> insert into table orc_a partition (y=2000, q)
> select cbigint, cdouble, csmallint % 10 from alltypesorc
> where cbigint is not null and csmallint > 0 order by cbigint asc;
> insert into table orc_a partition (y=2001, q)
> select cbigint, cdouble, csmallint % 10 from alltypesorc
> where cbigint is not null and csmallint > 0 order by cbigint asc;
> insert into table orc_b
> select cbigint, cfloat from alltypesorc
> where cbigint is not null and csmallint > 0 order by cbigint asc limit 200;
> set hive.cbo.enable=false;
> select y,q,count(*) from orc_a a join orc_b b on a.id=b.id group by y,q;
> set hive.enforce.sortmergebucketmapjoin=false;
> set hive.optimize.bucketmapjoin=true;
> set hive.optimize.bucketmapjoin.sortedmerge=true;
> set hive.auto.convert.sortmerge.join=true;
> set hive.auto.convert.join=true;
> set hive.auto.convert.join.noconditionaltask.size=10;
> explain
> select y,q,count(*) from orc_a a join orc_b b on a.id=b.id group by y,q;
> select y,q,count(*) from orc_a a join orc_b b on a.id=b.id group by y,q;
> DROP TABLE orc_a;
> DROP TABLE orc_b;
> {noformat}
> Produces different results for the two selects. The SMB one looks incorrect.
> cc [~djaiswal] [~hagleitn]
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