anew commented on code in PR #57365:
URL: https://github.com/apache/spark/pull/57365#discussion_r3627441034
##########
sql/pipelines/src/main/scala/org/apache/spark/sql/pipelines/autocdc/Scd2BatchProcessor.scala:
##########
@@ -811,6 +811,93 @@ case class Scd2BatchProcessor(
staged.select(outputColumns.toImmutableArraySeq: _*)
}
+ /**
+ * Drop delete-encoded rows (tombstones and decomposition tails) that became
redundant after
+ * reconciliation.
+ *
+ * A tombstone or decomposition tail is redundant when the immediately
preceding row's reconciled
+ * [[endAtColName]] equals its own sequence: the preceding upsert already
encodes the delete
+ * boundary, so the standalone delete-encoded row should no longer be routed
to aux.
+ *
+ * For example, an open upsert `[startAt=10, endAt=null)` followed by a
tombstone at `15`
Review Comment:
updated the comments to explain the examples in more detail
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