szehon-ho commented on code in PR #55887:
URL: https://github.com/apache/spark/pull/55887#discussion_r3247528433
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sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/PushDownUtils.scala:
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@@ -187,6 +193,90 @@ object PushDownUtils extends Logging {
}
}
+ /**
+ * Pushes runtime filters into `scan` and re-plans its input partitions. For
scans whose
+ * `outputPartitioning` is a [[KeyedPartitioning]] (SPJ-active), validates
that the data source
+ * preserved the original partitioning and pads with `None` to preserve key
alignment with the
+ * pre-filter partition set.
+ *
+ * Must be called at execute time: runtime filters carry
[[DynamicPruningExpression]] and
+ * scalar-subquery references whose values are only resolved after their
broadcast/subquery
+ * side completes. Callers should wrap the result in a `lazy val` so the
mutating
+ * [[pushRuntimeFilters]] call runs at most once per scan instance.
+ *
+ * @param scan the V2 scan to push filters into
+ * @param runtimeFilters runtime filters to translate and push
+ * @param partitionPredicateSchema by-name schema for iterative
[[PartitionPredicate]] pushdown
+ * @param output scan output attributes
+ * @param outputPartitioning Spark-side output partitioning (used for
SPJ validation)
+ * @param inputPartitions by-name original (unfiltered)
partitions; consulted only when
Review Comment:
should we rename, 'originalPartitions'. its a bit awkward to decipher what
the comment infers on the caller, i would just leave it those comments out and
just explain what it is.
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