RussellSpitzer commented on code in PR #11615:
URL: https://github.com/apache/iceberg/pull/11615#discussion_r1854422282
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spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/source/SparkScan.java:
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@@ -194,10 +205,40 @@ protected Statistics estimateStatistics(Snapshot
snapshot) {
Map<NamedReference, ColumnStatistics> colStatsMap = Collections.emptyMap();
if (readConf.reportColumnStats() && cboEnabled) {
colStatsMap = Maps.newHashMap();
+ Map<Integer, Long> ndvs = Maps.newHashMap();
+ Map<Integer, Long> nullCounts = Maps.newHashMap();
+ Map<Integer, Object> minValues = Maps.newHashMap();
+ Map<Integer, Object> maxValues = Maps.newHashMap();
List<StatisticsFile> files = table.statisticsFiles();
if (!files.isEmpty()) {
List<BlobMetadata> metadataList = (files.get(0)).blobMetadata();
+ if (readConf.deriveStatsFromManifestSessionConf()
+ || readConf.deriveStatsFromManifestTableProperty()) {
+ Map<String, Map<Integer, Long>> distinctDataFilesNullCount =
Maps.newHashMap();
Review Comment:
Yes, filescan tasks are not guaranteed to have non-overlapping groups of
files. That's why i suggested below just collecting them all up in a set before
collecting stats. Since all data files are "distinct" by definition we don't
really need it in a variable name.
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