[jira] [Assigned] (SPARK-56484) Filter's sizeInBytes estimation should not inflate over child's sizeInBytes when CBO is on.

["Dongjoon Hyun (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-56484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dongjoon Hyun reassigned SPARK-56484:
-------------------------------------

    Assignee: Ke Jia

> Filter's sizeInBytes estimation should not inflate over child's sizeInBytes when CBO is on.
> -------------------------------------------------------------------------------------------
>
>                 Key: SPARK-56484
>                 URL: https://issues.apache.org/jira/browse/SPARK-56484
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 4.1.1
>            Reporter: Ke Jia
>            Assignee: Ke Jia
>            Priority: Major
>              Labels: pull-request-available
>
> We observed a significant discrepancy in the logical plan's statistics estimation at the Filter node when running Q23a and Q23b in 10TB TPC-DS . For the customer table, the RelationV2 scan correctly identifies a sizeInBytes of 248.0 MiB based on actual metadata. However, after applying the Filter isnotnull(c_customer_sk) operator, the CBO inflates the estimated size to 743.9 MiB. Even though the rowCount remains unchanged , the heuristic recalculation of sizeInBytes triples the value. This data inflation after a filter causes the planner to exceed the 250 MiB threshold, incorrectly disabling the Broadcast Hash Join.



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