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Posted to issues@spark.apache.org by "Szehon Ho (Jira)" <ji...@apache.org> on 2026/09/23 21:52:00 UTC

[jira] [Assigned] (SPARK-59645) SCD1 Ignore-null support; Refactor SCD1 microbatch reconciliation into strategies

     [ https://issues.apache.org/jira/browse/SPARK-59645?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Szehon Ho reassigned SPARK-59645:
---------------------------------

    Assignee: Anish Mahto

> SCD1 Ignore-null support; Refactor SCD1 microbatch reconciliation into strategies 
> ----------------------------------------------------------------------------------
>
>                 Key: SPARK-59645
>                 URL: https://issues.apache.org/jira/browse/SPARK-59645
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Declarative Pipelines
>    Affects Versions: 4.4.0
>            Reporter: Anish Mahto
>            Assignee: Anish Mahto
>            Priority: Major
>              Labels: pull-request-available
>
> Default SCD1 reconciliation accepts or rejects an event wholesale, so all columns share one row-level version. Ignore-null permits different events to author different leaves, requiring fundamentally different deduplication and tombstone reconciliation.
> Refactor `Scd1BatchProcessor` to delegate to a reconciliation strategy and move existing behavior into the default `Scd1RowLevelReconciliation`. This preserves current behavior while establishing the boundary for future leaf-level reconciliation.



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