[SPARK-59183][SDP] SCD2 Ignore-null support; Populate version map per event row at ingest - #58645
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[SPARK-59183][SDP] SCD2 Ignore-null support; Populate version map per event row at ingest#58645AnishMahto wants to merge 15 commits into
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@jose-torres for review, see incremental diff. Diff is not as scary as line count suggests, 700+ is just unit tests. This PR simply adds logic to construct the version map per incoming row in the microbatch. Reconciliation of existing rows in the target/aux is not touched yet by this PR, that comes next. |
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This is a stacked PR. See incremental diff here: AnishMahto/spark@SPARK-59358-project-missing-columns-during-preprocessing...SPARK-59183-populate-verison-map-at-ingest
See previous PR in stack here: #58709
What changes were proposed in this pull request?
When processing an incoming microbatch, if ignore-null is enabled for the AutoCDC flow, a non-null version map needs to be populated for every row in the microbatch.
As per the version map contract (see
Scd2VersionMap's scaladoc), the version map is populated with null-authorship information for every event, respecting the currently active ignore-null selection.This ticket is not concerned with reconciling the microbatch's version maps with existing rows in the aux/target table.
Why are the changes needed?
Core part of the algorithm for supporting ignore-null API in SCD2.
Does this PR introduce any user-facing change?
No. The user facing interfaces for ignore-null are not exposed yet, this logic cannot be hit yet.
How was this patch tested?
Unit tests.
Was this patch authored or co-authored using generative AI tooling?
Co-authored with GPT-5.6 Sol.