RussellSpitzer commented on code in PR #10659:
URL: https://github.com/apache/iceberg/pull/10659#discussion_r1693627142


##########
spark/v3.5/spark/src/test/java/org/apache/iceberg/spark/source/TestSparkScan.java:
##########
@@ -130,6 +142,98 @@ public void testEstimatedRowCount() throws 
NoSuchTableException {
     assertThat(stats.numRows().getAsLong()).isEqualTo(10000L);
   }
 
+  @TestTemplate
+  public void testColStats() throws NoSuchTableException {
+    sql("CREATE TABLE %s (id int, data string) USING iceberg", tableName);
+
+    List<SimpleRecord> records =
+        Lists.newArrayList(
+            new SimpleRecord(1, "a"),
+            new SimpleRecord(2, "b"),
+            new SimpleRecord(3, "a"),
+            new SimpleRecord(4, "b"));
+    spark
+        .createDataset(records, Encoders.bean(SimpleRecord.class))
+        .coalesce(1)
+        .writeTo(tableName)
+        .append();
+
+    Table table = validationCatalog.loadTable(tableIdent);
+    long snapshotId = table.currentSnapshot().snapshotId();
+
+    SparkScanBuilder scanBuilder =
+        new SparkScanBuilder(spark, table, CaseInsensitiveStringMap.empty());
+    SparkScan scan = (SparkScan) scanBuilder.build();
+
+    Map<String, String> reportColStatsDisabled =
+        ImmutableMap.of(
+            SQLConf.CBO_ENABLED().key(), "true", 
SparkSQLProperties.REPORT_COLUMN_STATS, "false");
+
+    Map<String, String> reportColStatsEnabled =
+        ImmutableMap.of(SQLConf.CBO_ENABLED().key(), "true");
+
+    // Test table does not have col stats
+    checkColStatisticsNotReported(scan, 4L);
+    withSQLConf(reportColStatsDisabled, () -> 
checkColStatisticsNotReported(scan, 4L));
+    // The expected col NDVs are nulls
+    withSQLConf(reportColStatsEnabled, () -> checkColStatisticsReported(scan, 
4L, new HashMap<>()));
+
+    GenericStatisticsFile statisticsFile =
+        new GenericStatisticsFile(
+            snapshotId,
+            "/test/statistics/file.puffin",
+            100,
+            42,
+            ImmutableList.of(
+                new GenericBlobMetadata(
+                    APACHE_DATASKETCHES_THETA_V1,
+                    snapshotId,
+                    1,
+                    ImmutableList.of(1),
+                    ImmutableMap.of("ndv", "4"))));
+
+    table.updateStatistics().setStatistics(snapshotId, 
statisticsFile).commit();
+
+    // Test where 1 column has NDV and the other does not have NDV
+    checkColStatisticsNotReported(scan, 4L);
+    withSQLConf(reportColStatsDisabled, () -> 
checkColStatisticsNotReported(scan, 4L));
+
+    HashMap<String, Long> expectedOneNDV = new HashMap<>();
+    expectedOneNDV.put("id", 4L);
+    withSQLConf(reportColStatsEnabled, () -> checkColStatisticsReported(scan, 
4L, expectedOneNDV));
+
+    statisticsFile =

Review Comment:
   I'd split this one out into another test, minor nit



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