jeesou commented on code in PR #11035:
URL: https://github.com/apache/iceberg/pull/11035#discussion_r1802355766


##########
spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/source/SparkScan.java:
##########
@@ -198,25 +198,31 @@ protected Statistics estimateStatistics(Snapshot 
snapshot) {
       if (!files.isEmpty()) {
         List<BlobMetadata> metadataList = (files.get(0)).blobMetadata();
 
-        for (BlobMetadata blobMetadata : metadataList) {
-          int id = blobMetadata.fields().get(0);
-          String colName = table.schema().findColumnName(id);
+        Map<Integer, List<BlobMetadata>> groupedByField =
+            metadataList.stream()
+                .collect(
+                    Collectors.groupingBy(
+                        metadata -> metadata.fields().get(0), 
Collectors.toList()));
+
+        for (Map.Entry<Integer, List<BlobMetadata>> entry : 
groupedByField.entrySet()) {
+          String colName = table.schema().findColumnName(entry.getKey());
           NamedReference ref = FieldReference.column(colName);
-
           Long ndv = null;
-          if (blobMetadata
-              .type()
-              
.equals(org.apache.iceberg.puffin.StandardBlobTypes.APACHE_DATASKETCHES_THETA_V1))
 {
-            String ndvStr = blobMetadata.properties().get(NDV_KEY);
-            if (!Strings.isNullOrEmpty(ndvStr)) {
-              ndv = Long.parseLong(ndvStr);
+
+          for (BlobMetadata blobMetadata : entry.getValue()) {
+            if (blobMetadata
+                .type()
+                
.equals(org.apache.iceberg.puffin.StandardBlobTypes.APACHE_DATASKETCHES_THETA_V1))
 {
+              String ndvStr = blobMetadata.properties().get(NDV_KEY);
+              if (!Strings.isNullOrEmpty(ndvStr)) {
+                ndv = Long.parseLong(ndvStr);
+              } else {
+                LOG.debug("ndv is not set in BlobMetadata for column {}", 
colName);

Review Comment:
   Updated



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