[jira] [Work logged] (HIVE-25028) Hive: Select query with IS operator producing unexpected result

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-25028?focusedWorklogId=586603&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-586603 ]

ASF GitHub Bot logged work on HIVE-25028:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 21/Apr/21 14:14
            Start Date: 21/Apr/21 14:14
    Worklog Time Spent: 10m 
      Work Description: kasakrisz merged pull request #2190:
URL: https://github.com/apache/hive/pull/2190


   


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Issue Time Tracking
-------------------

            Worklog Id:     (was: 586603)
    Remaining Estimate: 0h
            Time Spent: 10m

> Hive: Select query with IS operator producing unexpected result
> ---------------------------------------------------------------
>
>                 Key: HIVE-25028
>                 URL: https://issues.apache.org/jira/browse/HIVE-25028
>             Project: Hive
>          Issue Type: Bug
>          Components: Parser
>            Reporter: Manthan B Y
>            Assignee: Soumyakanti Das
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Hive: Select query with IS operator is producing unexpected result.
> The following was executed on postgres:
> {code:java}
> sqlancer=# create table if not exists emp(name text, age int);
> CREATE TABLE
> sqlancer=# insert into emp values ('a', 5), ('b', 15), ('c', 12);
> INSERT 0 3
> sqlancer=# select emp.age from emp where emp.age > 10;
>  age
> -----
>   15
>   12
> (2 rows)sqlancer=# select emp.age > 10 is true from emp;
>  ?column?
> ----------
>  f
>  t
>  t
> (3 rows){code}
> This is happening because IS operator has higher precedence than comparison operators in Hive. In most other databases, comparison operator has higher precedence. The grammar needs to be changed to fix the precedence.



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