ajantha-bhat commented on code in PR #12629:
URL: https://github.com/apache/iceberg/pull/12629#discussion_r2013945601
##########
data/src/main/java/org/apache/iceberg/data/PartitionStatsHandler.java:
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@@ -149,6 +162,92 @@ public static PartitionStatisticsFile
computeAndWriteStatsFile(Table table, long
table, snapshot.snapshotId(), schema(partitionType), sortedStats);
}
+ /**
+ * Incrementally computes the stats after the snapshot that has partition
stats file till the
+ * given snapshot and writes the combined result into a {@link
PartitionStatisticsFile} after
+ * merging the stats.
+ *
+ * @param table The {@link Table} for which the partition statistics is
computed.
+ * @param snapshotId snapshot for which partition statistics are computed.
+ * @return {@link PartitionStatisticsFile} for the given snapshot, or null
if no statistics are
+ * present.
+ */
+ public static PartitionStatisticsFile computeAndWriteStatsFileIncremental(
+ Table table, long snapshotId) throws IOException {
+ Preconditions.checkArgument(table != null, "Table cannot be null");
+ Snapshot snapshot = table.snapshot(snapshotId);
+ Preconditions.checkArgument(snapshot != null, "Snapshot not found: %s",
snapshotId);
+
+ StructType partitionType = Partitioning.partitionType(table);
+ Schema statsFileSchema = schema(partitionType);
+ PartitionStatisticsFile statisticsFile = latestStatsFile(table,
snapshotId);
Review Comment:
`collectStats` is a `core` module API which doesn't have dependency on
`data` module (`PartitionStatsHandler`).
`PartitionStatsHandler` is responsible for reading the stats file (including
old stats). So, this logic of finding the old stats and reading is kept here
instead of core module API.
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