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https://issues.apache.org/jira/browse/HIVE-3534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13659184#comment-13659184
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Edward Capriolo commented on HIVE-3534:
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This patch adds a left explode UDF. Works like a left join in that if the thing
being exploded is empty it returns NULL so the right row matches with something.
> Add left Lateral view syntax
> ----------------------------
>
> Key: HIVE-3534
> URL: https://issues.apache.org/jira/browse/HIVE-3534
> Project: Hive
> Issue Type: New Feature
> Reporter: Edward Capriolo
> Assignee: Edward Capriolo
> Attachments: hive-3534.diff.txt
>
>
> A lateral view is like a join and if the function in question (like
> explode()) produces zero rows then you lose the row
> whereas conceivably you could keep the row and just fill all entry with nulls.
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