[SPARK-59183][SDP] SCD2 Ignore-null support; Populate version map per event row at ingest - #58645
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AnishMahto wants to merge 16 commits into
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[SPARK-59183][SDP] SCD2 Ignore-null support; Populate version map per event row at ingest#58645AnishMahto wants to merge 16 commits into
AnishMahto wants to merge 16 commits into
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Add a nullable __VERSION_MAP field (Map<String, Boolean>) to the SCD2 _cdc_metadata struct. This field will track per-column authorship for ignore-null semantics in a future change; for now it is always null. Source changes: - Introduce Scd2VersionMap with mapType and authorship contract docs. - Add versionMapFieldName, versionMapOf to Scd2BatchProcessor companion. - Extend cdcMetadataColSchema and constructCdcMetadataCol with the new field. All four call sites pass versionMap explicitly (no default). - Decomposition tails and tombstones always receive a null version map (synthetic rows carry no authorship claim). Test changes: - Update all Row(...) constructions for CDC metadata structs across Scd2BatchProcessorSuite, Scd2BatchProcessorMergeSuite, Scd2ForeachBatchHandlerSuite, and 7 graph execution test suites. - Fix schema-preservation tests to use the production two-field cdcMetadataInnerSchema. - Update scd2MetadataDdl in AutoCdcGraphExecutionTestMixin.
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This is a stacked PR. See incremental diff here: AnishMahto/spark@SPARK-59208-introduce-ignore-null-change-arg...SPARK-59183-populate-verison-map-at-ingest
See previous PR in stack here: #58505
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.