findepi commented on code in PR #10659:
URL: https://github.com/apache/iceberg/pull/10659#discussion_r1683949890


##########
spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/source/SparkScan.java:
##########
@@ -175,7 +184,37 @@ public Statistics estimateStatistics() {
   protected Statistics estimateStatistics(Snapshot snapshot) {
     // its a fresh table, no data
     if (snapshot == null) {
-      return new Stats(0L, 0L);
+      return new Stats(0L, 0L, Collections.emptyMap());
+    }
+
+    boolean cboEnabled =
+        Boolean.parseBoolean(spark.conf().get(SQLConf.CBO_ENABLED().key(), 
"false"));
+    Map<NamedReference, ColumnStatistics> colStatsMap = null;
+    if (readConf.enableColumnStats() && cboEnabled) {
+      colStatsMap = Maps.newHashMap();
+      List<StatisticsFile> files = table.statisticsFiles();
+      if (!files.isEmpty()) {
+        List<BlobMetadata> metadataList = (files.get(0)).blobMetadata();
+
+        for (BlobMetadata blobMetadata : metadataList) {
+          int id = blobMetadata.fields().get(0);

Review Comment:
   Correct, the `apache-datasketches-theta-v1` should be calculated on one 
field.
   And yes, there should be the `ndv` property set. The property may seem 
somewhat redundant within the Puffin file, but allow faster access to the 
information at SELECT-time. More importantly, the properties are propagated to 
the table metadata and so a query planner accesses the NDV information without 
opening the Puffin file at all.



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