viirya commented on code in PR #47426:
URL: https://github.com/apache/spark/pull/47426#discussion_r1704570702
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sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/EnsureRequirements.scala:
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@@ -429,8 +429,19 @@ case class EnsureRequirements(
// expressions
val partitionExprs = leftSpec.partitioning.expressions
- var mergedPartValues = InternalRowComparableWrapper
- .mergePartitions(leftSpec.partitioning, rightSpec.partitioning,
partitionExprs)
+ // in case of compatible but not identical partition expressions, we
apply 'reduce'
+ // transforms to group one side's partitions as well as the common
partition values
+ val leftReducers = leftSpec.reducers(rightSpec)
+ val leftParts = reducePartValues(leftSpec.partitioning.partitionValues,
+ partitionExprs,
+ leftReducers)
+ val rightReducers = rightSpec.reducers(leftSpec)
+ val rightParts =
reducePartValues(rightSpec.partitioning.partitionValues,
+ partitionExprs,
Review Comment:
`partitionExprs` are from left spec. As this goes to reduce on right spec.
Does it guarantee that right spec's partition expressions have same data types
as left spec?
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