Zoltan Haindrich created HIVE-16505:
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Summary: Support "unknown" boolean truth value
Key: HIVE-16505
URL: https://issues.apache.org/jira/browse/HIVE-16505
Project: Hive
Issue Type: Sub-task
Reporter: Zoltan Haindrich
according to the standard, boolean truth value might be: {{TRUE|FALSE|UNKNOWN}}.
similar queries to the following should be supported:
{code}
select 1 where null is unknown;
select 1 where (select cast(null as boolean) ) is unknown;
{code}
"unknown" behaves similarily to null. {{(null=null) is null}}
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