jihoonson commented on a change in pull request #6888: Fix num_rows in 
sys.segments
URL: https://github.com/apache/incubator-druid/pull/6888#discussion_r254509558
 
 

 ##########
 File path: 
sql/src/test/java/org/apache/druid/sql/calcite/schema/DruidSchemaTest.java
 ##########
 @@ -239,6 +246,34 @@ public void testGetTableMapFoo2()
     Assert.assertEquals(SqlTypeName.BIGINT, 
fields.get(2).getType().getSqlTypeName());
   }
 
+  @Test
+  public void testSegmentMetadataHolderNumRows()
+  {
+    Map<DataSegment, SegmentMetadataHolder> segmentsMetadata = 
schema.getSegmentMetadata();
+    Set<DataSegment> segments = segmentsMetadata.keySet();
+    Assert.assertEquals(segments.size(), 3);
+    DataSegment existingSegment = segments.stream().findFirst().orElse(null);
+    Assert.assertFalse(existingSegment == null);
+    SegmentMetadataHolder existingHolder = 
segmentsMetadata.get(existingSegment);
+    SegmentMetadataHolder updatedHolder = 
SegmentMetadataHolder.from(existingHolder).withNumRows(5).build();
+    schema.setSegmentMetadataHolder(existingSegment, updatedHolder);
+    ImmutableDruidServer server = null;
+    for (ImmutableDruidServer druidServer : druidServers) {
+      for (DataSegment segment : druidServer.getSegments()) {
+        if (segment == existingSegment) {
+          server = druidServer;
+        }
+      }
+    }
+    Assert.assertFalse(server == null);
+    final DruidServerMetadata druidServerMetadata = server.getMetadata();
+    schema.addSegment(druidServerMetadata, existingSegment);
+    segmentsMetadata = schema.getSegmentMetadata();
+    existingSegment = segments.stream().findFirst().orElse(null);
+    final SegmentMetadataHolder currentHolder = 
segmentsMetadata.get(existingSegment);
+    Assert.assertEquals(updatedHolder.getNumRows(), 
currentHolder.getNumRows());
 
 Review comment:
   Please check other fields as well.

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