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https://issues.apache.org/jira/browse/HIVE-16505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16506788#comment-16506788
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Hive QA commented on HIVE-16505:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m
0s{color} | {color:green} The patch has no whitespace issues. {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
44s{color} | {color:green} The patch does not generate ASF License warnings.
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| {color:black}{color} | {color:black} {color} | {color:black} 1m 16s{color} |
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|| Subsystem || Report/Notes ||
| Optional Tests | asflicense |
| uname | Linux hiveptest-server-upstream 3.16.0-4-amd64 #1 SMP Debian
3.16.36-1+deb8u1 (2016-09-03) x86_64 GNU/Linux |
| Build tool | maven |
| Personality |
/data/hiveptest/working/yetus_PreCommit-HIVE-Build-11641/dev-support/hive-personality.sh
|
| git revision | master / 6454585 |
| modules | C: ql U: ql |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-11641/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> Support "unknown" boolean truth value
> -------------------------------------
>
> Key: HIVE-16505
> URL: https://issues.apache.org/jira/browse/HIVE-16505
> Project: Hive
> Issue Type: Sub-task
> Components: SQL
> Reporter: Zoltan Haindrich
> Assignee: Laszlo Bodor
> Priority: Major
> Attachments: HIVE-16505.01.patch, HIVE-16505.02.patch,
> HIVE-16505.03.patch, HIVE-16505.04.patch
>
>
> according to the standard, boolean truth value might be:
> {{TRUE|FALSE|UNKNOWN}}.
> similar queries to the following should be supported:
> {code:java}
> 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}}
>
> "All boolean values and SQL truth values are comparable and all are
> assignable to a site of type boolean. The value True is greater than the
> value False, and any comparison involving the null value or an Unknown truth
> value will return an Unknown result. The values True and False may be
> assigned to any site having a boolean data type; assignment of Unknown, or
> the null value, is subject to the nullability characteristic of the target."
>
> *Truth table for the AND boolean operator*
> AND True False Unknown
> True True False Unknown
> False False False False
> Unknown Unknown False Unknown
> *Truth table for the OR boolean operator*
> OR True False Unknown
> True True True True
> False True False Unknown
> Unknown True Unknown Unknown
> *Truth table for the IS boolean operator*
> IS TRUE FALSE UNKNOWN
> True True False False
> False False True False
> Unknown False False True
>
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