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https://issues.apache.org/jira/browse/HIVE-15986?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vineet Garg updated HIVE-15986:
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Status: Patch Available (was: Open)
Since {{is distinct from}} is equivalent to {{NOT <=>}} we decided to use
existing UDFs instead of adding brand new ones. Latest patch contain this
change.
Ideally the grammar should be rewriting this expression into {{<=>}} but I
couldn't figure out how to rewrite it, so instead now during AST to Expr
conversion ast nodes are replaced with null safe equality's UDFs
> Support "is [not] distinct from"
> --------------------------------
>
> Key: HIVE-15986
> URL: https://issues.apache.org/jira/browse/HIVE-15986
> Project: Hive
> Issue Type: Sub-task
> Components: SQL
> Reporter: Carter Shanklin
> Assignee: Vineet Garg
> Attachments: HIVE-15986.1.patch, HIVE-15986.2.patch
>
>
> Support standard "is [not] distinct from" syntax. For example this gives a
> standard way to do a comparison to null safe join: select * from t1 join t2
> on t1.x is not distinct from t2.y. SQL standard reference Section 8.15
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