SourabhBadhya commented on code in PR #3801:
URL: https://github.com/apache/hive/pull/3801#discussion_r1067811008


##########
itests/hive-unit/src/test/java/org/apache/hadoop/hive/ql/txn/compactor/TestCrudCompactorOnTez.java:
##########
@@ -3189,11 +3302,42 @@ private void testCompactionWithMerge(CompactionType 
compactionType, boolean isPa
     // Verify delete delta
     Assert.assertTrue(CompactorTestUtil.getBaseOrDeltaNames(fs, 
AcidUtils.deleteEventDeltaDirFilter, table,
             partitionName).isEmpty());
-    // Run a compaction
-    if (partitionName == null) {
-      CompactorTestUtil.runCompaction(conf, dbName, tableName, compactionType, 
true);
-    } else {
-      CompactorTestUtil.runCompaction(conf, dbName, tableName, compactionType, 
true, partitionName);
+    // Run a compaction which uses only merge compactor / query-based 
compaction
+    CompactorFactory compactorFactory = mock(CompactorFactory.class);
+    // Return mocked instance of CompactorFactory
+    try (MockedStatic mockedStatic = mockStatic(CompactorFactory.class)) {
+      
mockedStatic.when(CompactorFactory::getInstance).thenReturn(compactorFactory);
+      Compactor compactor;
+      List<Compactor> compactorList = new ArrayList<>();
+      if (useFallback) {
+        // Create a mock of merge compactor
+        compactor = mock(MergeCompactor.class);
+        compactorList.add(compactor);
+        if (compactionType == CompactionType.MAJOR) {
+          compactorList.add(new MajorQueryCompactor());
+        } else {
+          compactorList.add(new MinorQueryCompactor());
+        }
+      } else {
+        // Create a mock of major/minor compactor
+        if (compactionType == CompactionType.MAJOR) {
+          compactor = mock(MajorQueryCompactor.class);
+        } else {
+          compactor = mock(MinorQueryCompactor.class);
+        }
+        compactorList.add(new MergeCompactor());
+        compactorList.add(compactor);
+      }
+      // Mocked compaction always returns false
+      when(compactor.run(any(), any(), any(), any(), any(), any(), 
any())).thenReturn(false);
+      CompactorChain compactorChain = new CompactorChain(compactorList);
+      // Return mocked compactor chain
+      when(compactorFactory.getCompactor(any(), any(), any(), 
any())).thenReturn(compactorChain);
+      if (partitionName == null) {
+        CompactorTestUtil.runCompaction(conf, dbName, tableName, 
compactionType, true);
+      } else {
+        CompactorTestUtil.runCompaction(conf, dbName, tableName, 
compactionType, true, partitionName);
+      }

Review Comment:
   Implemented using spies and made sure we are not creating a compactor chain 
again. Fetched the array of compactors using reflection and changed the 
compactor objects to corresponding spies.



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