gargvishesh commented on code in PR #15965:
URL: https://github.com/apache/druid/pull/15965#discussion_r1535066315


##########
extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/ControllerImpl.java:
##########
@@ -1719,9 +1731,129 @@ private void publishSegmentsIfNeeded(
       //noinspection unchecked
       @SuppressWarnings("unchecked")
       final Set<DataSegment> segments = (Set<DataSegment>) 
queryKernel.getResultObjectForStage(finalStageId);
+
+      Function<Set<DataSegment>, Set<DataSegment>> 
compactionStateAnnotateFunction = Function.identity();
+
+      Boolean storeCompactionState = (Boolean) task.getQuerySpec()
+                                                   .getQuery()
+                                                   .getContext()
+                                                   
.get(Tasks.STORE_COMPACTION_STATE_KEY);
+
+      if (storeCompactionState == null) {
+        storeCompactionState = Tasks.DEFAULT_STORE_COMPACTION_STATE;
+
+      }
+
+      if (!segments.isEmpty() && storeCompactionState) {
+        DataSchema dataSchema = ((SegmentGeneratorFrameProcessorFactory) 
queryKernel.getStageDefinition(finalStageId)
+                                                                               
     .getProcessorFactory()).getDataSchema();
+
+
+        ShardSpec shardSpec = 
segments.stream().findFirst().get().getShardSpec();
+
+        compactionStateAnnotateFunction = compactionStateAnnotateFunction(
+            task(),
+            context.jsonMapper(),
+            dataSchema,
+            shardSpec,
+            queryDef.getQueryId()
+        );
+
+      }
+
       log.info("Query [%s] publishing %d segments.", queryDef.getQueryId(), 
segments.size());
-      publishAllSegments(segments);
+      publishAllSegments(compactionStateAnnotateFunction.apply(segments));
+    }
+  }
+
+  public static Function<Set<DataSegment>, Set<DataSegment>> 
compactionStateAnnotateFunction(
+      MSQControllerTask task, ObjectMapper jsonMapper, DataSchema dataSchema, 
ShardSpec shardSpec, String queryId
+  )
+  {
+    DataSourceMSQDestination destination = (DataSourceMSQDestination) 
task.getQuerySpec().getDestination();
+    if (!destination.isReplaceTimeChunks()) {
+      // Only do this for replace queries, whether originating directly or via 
compaction
+      log.error("Query [%s] skipping storing compaction state in segments as 
query not of type REPLACE.", queryId);
+      return Function.identity();
     }
+
+    GranularitySpec granularitySpec = dataSchema.getGranularitySpec();
+
+    if 
(task.getQuerySpec().getQuery().getContext().get(DruidSqlInsert.SQL_INSERT_SEGMENT_GRANULARITY)
 == null) {

Review Comment:
   Not required at all actually, since the segmentGranularity extraction 
function used later will never return null. Removed it.



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