codope commented on code in PR #10352:
URL: https://github.com/apache/hudi/pull/10352#discussion_r1578977183
##########
hudi-common/src/main/java/org/apache/hudi/common/util/BaseFileUtils.java:
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@@ -67,6 +70,50 @@ public static BaseFileUtils getInstance(HoodieFileFormat
fileFormat) {
throw new UnsupportedOperationException(fileFormat.name() + " format not
supported yet.");
}
+ /**
+ * Aggregate column range statistics across files in a partition.
+ *
+ * @param fileRanges List of column range statistics for each file in a
partition
+ */
+ public static <T extends Comparable<T>> HoodieColumnRangeMetadata<T>
getColumnRangeInPartition(@Nonnull List<HoodieColumnRangeMetadata<T>>
fileRanges) {
+ if (fileRanges.size() == 1) {
+ // Only one parquet file, we can just return that range.
+ return fileRanges.get(0);
+ }
+ // There are multiple files. Compute min(file_mins) and max(file_maxs)
+ return fileRanges.stream()
+ .sequential()
+ .reduce(BaseFileUtils::mergeRanges).get();
+ }
+
+ private static <T extends Comparable<T>> HoodieColumnRangeMetadata<T>
mergeRanges(HoodieColumnRangeMetadata<T> one,
Review Comment:
Yes in `ParquetUtils`, some portion of this logic is duplicate. I have
extracted to a common method in `BaseFileUtils` now.
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