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https://issues.apache.org/jira/browse/HIVE-2520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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binlijin updated HIVE-2520:
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Status: Patch Available (was: Open)
> left semi join will duplicate data
> ----------------------------------
>
> Key: HIVE-2520
> URL: https://issues.apache.org/jira/browse/HIVE-2520
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: binlijin
> Assignee: binlijin
> Priority: Critical
> Labels: patch
> Attachments: hive-2520.2.patch, hive-2520.patch
>
>
> CREATE TABLE sales (name STRING, id INT)
> ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';
> CREATE TABLE things (id INT, name STRING)
> ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';
> The 'sales' table has data in a file: sales.txt, and the data is：
> Joe 2
> Hank 2
> The 'things' table has data int two files: things.txt and things2.txt：
> The content of things.txt is :
> 2 Tie
> The content of things2.txt is :
> 2 Tie
> SELECT * FROM sales LEFT SEMI JOIN things ON (sales.id = things.id);
> will output：
> Joe 2
> Joe 2
> Hank 2
> Hank 2
> so the result is wrong.
> In CommonJoinOperator left semi join should use " genObject(null, 0, new
> IntermediateObject(new ArrayList[numAliases], 0), true); " to generate data.
> but now it uses " genUniqueJoinObject(0, 0); " to generate data.
> This patch will solve this problem.
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