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https://issues.apache.org/jira/browse/HIVE-969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12785515#action_12785515
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Jeff Hammerbacher commented on HIVE-969:
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In the absence of statistics, how will you know which table is largest?
> choose the largest table for join as the table to be streamed
> -------------------------------------------------------------
>
> Key: HIVE-969
> URL: https://issues.apache.org/jira/browse/HIVE-969
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
>
> In absence of statistics, the join order is random. This creates a problem
> for the users since mostly they dont care about the size of the tables
> So, instead of choosing the join order randomly, we can make the largest
> table as the table to be streamed if the user did not specify any hints.
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