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https://issues.apache.org/jira/browse/SPARK-56856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-56856:
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Labels: pull-request-available (was: )
> Implement SCD1 Batch Processor; Microbatch Deduplication
> --------------------------------------------------------
>
> Key: SPARK-56856
> URL: https://issues.apache.org/jira/browse/SPARK-56856
> 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.
>
> {*}Microbatch Deduplication{*}:
> The first step of microbatch reconciliation for SCD1 is deduplicating the
> microbatch such that there is a single row per key.
> Since SCD1 is only concerned with maintaining _latest_ state per key from the
> change data source, within a microbatch we only care about the row with the
> latest sequencing per key - drop all other rows for that same key.
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