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https://issues.apache.org/jira/browse/SPARK-56882?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-56882:
-----------------------------------
Labels: pull-request-available (was: )
> Implement SCD1 Batch Processor; Target Column Projection
> --------------------------------------------------------
>
> Key: SPARK-56882
> URL: https://issues.apache.org/jira/browse/SPARK-56882
> Project: Spark
> Issue Type: Sub-task
> Components: Declarative Pipelines
> Affects Versions: 4.2.0, 4.3.0
> Reporter: Anish Mahto
> Priority: Major
> Labels: pull-request-available
>
> {*}Preamble{*}:
> The SCD type 1 flow is a foreachBatch streaming query on an input
> change-data-feed, and is responsible for reconciling the incoming change data
> onto some target table that follows SCD1 replication semantics.
> SCD1 flows also maintain an "auxiliary" table to keep track of early-arriving
> out-of-order received events state. Each microbatch will need to reconcile
> against this auxiliary table as well, and update the auxiliary table's state
> appropriately for future microbatches.
>
> {*}Target Column Projection{*}:
> As per the SPIP and `ChangeArgs.columnSelection`, users are allowed to
> specify the set of columns that actually gets persisted in the target table.
> Any columns not selected should be dropped before target table
> merge/persistence.
> We should project only these selected columns onto the microbatch so that its
> dataframe is in the correct shape prior to CDC processing and merging into
> the target table.
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