[jira] [Updated] (HIVE-26643) HiveUnionPullUpConstantsRule produces an invalid plan when pulling up constants for nullable fields

["Alessandro Solimando (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-26643?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alessandro Solimando updated HIVE-26643:
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    Summary: HiveUnionPullUpConstantsRule produces an invalid plan when pulling up constants for nullable fields  (was: HiveUnionPullUpConstantsRule fails when pulling up constants for nullable fields)

> HiveUnionPullUpConstantsRule produces an invalid plan when pulling up constants for nullable fields
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-26643
>                 URL: https://issues.apache.org/jira/browse/HIVE-26643
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>    Affects Versions: 4.0.0-alpha-2
>            Reporter: Alessandro Solimando
>            Assignee: Alessandro Solimando
>            Priority: Major
>
> The rule does pull up constants without checking/adjusting nullability to match that of the field type. 
> Here is the stack-trace when a nullable type is involved:
> {code:java}
> java.lang.AssertionError: Cannot add expression of different type to set:
> set type is RecordType(JavaType(class java.lang.Integer) f1, JavaType(int) NOT NULL f2) NOT NULL
> expression type is RecordType(JavaType(int) NOT NULL f1, JavaType(int) NOT NULL f2) NOT NULL
> set is rel#38:HiveUnion.(input#0=HepRelVertex#35,input#1=HepRelVertex#35,all=true)
> expression is HiveProject(f1=[1], f2=[$0])
>   HiveUnion(all=[true])
>     HiveProject(f2=[$1])
>       HiveProject(f1=[$0], f2=[$1])
>         HiveFilter(condition=[=($0, 1)])
>           LogicalTableScan(table=[[]])
>     HiveProject(f2=[$1])
>       HiveProject(f1=[$0], f2=[$1])
>         HiveFilter(condition=[=($0, 1)])
>           LogicalTableScan(table=[[]])
> {code}
> The solution is to check nullability and add a cast when the field is nullable, since the constant's type is not.



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