[jira] [Assigned] (HIVE-22903) Vectorized row_number() resets the row number after one batch in case of constant expression in partition clause

["Shubham Chaurasia (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-22903?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shubham Chaurasia reassigned HIVE-22903:
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> Vectorized row_number() resets the row number after one batch in case of constant expression in partition clause
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-22903
>                 URL: https://issues.apache.org/jira/browse/HIVE-22903
>             Project: Hive
>          Issue Type: Bug
>          Components: UDF, Vectorization
>    Affects Versions: 4.0.0
>            Reporter: Shubham Chaurasia
>            Assignee: Shubham Chaurasia
>            Priority: Major
>
> Vectorized row number implementation resets the row number when constant expression is passed in partition clause.
> Repro Query
> {code}
> select row_number() over(partition by 1) r1, t from over10k_n8;
> Or
> select row_number() over() r1, t from over10k_n8;
> {code}
> where table over10k_n8 contains more than 1024 records.
> This happens because currently in VectorPTFOperator, we reset evaluators if only partition clause is there.
> {code:java}
>     // If we are only processing a PARTITION BY, reset our evaluators.
>     if (!isPartitionOrderBy) {
>       groupBatches.resetEvaluators();
>     }
> {code}
> To resolve, we should also check if the entire partition clause is a constant expression, if it is so then we should not do {{groupBatches.resetEvaluators()}}



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