pvary commented on code in PR #12651:
URL: https://github.com/apache/iceberg/pull/12651#discussion_r2030691765
##########
core/src/main/java/org/apache/iceberg/actions/BinPackRewriteFilePlanner.java:
##########
@@ -278,10 +278,11 @@ private StructLikeMap<List<FileScanTask>>
groupByPartition(
for (FileScanTask task : tasks) {
// If a task uses an incompatible partition spec the data inside could
contain values
- // which belong to multiple partitions in the current spec. Treating all
such files as
- // un-partitioned and grouping them together helps to minimize new files
made.
+ // which belong to multiple partitions in the current spec.
StructLike taskPartition =
- task.file().specId() == table.spec().specId() ?
task.file().partition() : emptyStruct;
+
table.spec().equalOrFinerThan(table.specs().get(task.file().specId()))
+ ? task.file().partition()
+ : emptyStruct;
Review Comment:
This changes the planning results, so it would be good to add testing to the
core module too, which checks the generated plan is correct
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