ajantha-bhat commented on code in PR #12629:
URL: https://github.com/apache/iceberg/pull/12629#discussion_r2009808294
##########
data/src/main/java/org/apache/iceberg/data/PartitionStatsHandler.java:
##########
@@ -150,6 +161,75 @@ 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);
+ Collection<PartitionStats> stats;
+ if (statisticsFile == null) {
+ LOG.info("Previous stats not found. Computing the stats for whole
table.");
+ stats = PartitionStatsUtil.computeStats(table,
table.snapshot(snapshotId));
+ } else {
+ PartitionMap<PartitionStats> statsMap =
PartitionMap.create(table.specs());
+ // read previous stats
+ try (CloseableIterable<PartitionStats> oldStats =
+ readPartitionStatsFile(statsFileSchema,
Files.localInput(statisticsFile.path()))) {
Review Comment:
since the new unified tuple is used for reading the old stats file. It
automatically handled the schema evolution.
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