openinx commented on a change in pull request #1704:
URL: https://github.com/apache/iceberg/pull/1704#discussion_r533263788
##########
File path:
core/src/main/java/org/apache/iceberg/actions/BaseRewriteDataFilesAction.java
##########
@@ -226,11 +226,16 @@ public RewriteDataFilesActionResult execute() {
return TableScanUtil.planTasks(splitTasks, targetSizeInBytes,
splitLookback, splitOpenFileCost);
})
.flatMap(Streams::stream)
+ .filter(task -> task.files().size() > 1)
.collect(Collectors.toList());
+ if (combinedScanTasks.isEmpty()) {
+ return RewriteDataFilesActionResult.empty();
+ }
+
List<DataFile> addedDataFiles = rewriteDataForTasks(combinedScanTasks);
- List<DataFile> currentDataFiles = filteredGroupedTasks.values().stream()
- .flatMap(tasks -> tasks.stream().map(FileScanTask::file))
+ List<DataFile> currentDataFiles = combinedScanTasks.stream()
Review comment:
I think we should not rely on specific file-selection strategies here,
because different selection strategies may result in duplicated files for
`currentDataFiles`. The correct way is: remove the duplicated files so that
the `currentDataFiles` has correct files.
I saw the
[here](https://github.com/apache/iceberg/pull/1704/files#diff-a330da6f6014d3154bb0979281e53f2b69c9e32117d0223bdf94d514a05cf559R264)
has used the `set` to remove duplicated files. So it's OK now.
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