Anish Mahto created SPARK-57395:
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Summary: Implement SCD2 Batch Processor; foreachBatch Callback
Key: SPARK-57395
URL: https://issues.apache.org/jira/browse/SPARK-57395
Project: Spark
Issue Type: Sub-task
Components: Declarative Pipelines
Affects Versions: 4.3.0
Reporter: Anish Mahto
{*}Preamble{*}:
The SCD type 2 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 SCD2 replication semantics.
SCD2 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.
*foreachBatch Callback*
Implementation of the actual callback that will be passed into the foreachBatch
streaming query for SCD2 flows.
The callback orchestrates calling all of the `Scd2BatchProcessor` helpers to
execute the complete reconciliation of a change-data-feed microbatch onto the
auxiliary and target tables.
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