diff --git a/src/backend/gporca/libgpopt/include/gpopt/base/CQueryContext.h b/src/backend/gporca/libgpopt/include/gpopt/base/CQueryContext.h
index bd6bbc50d7955e9f56a15ee1f8174477af5a969b..97b56060940911aa6ea99ecd28582a4c7c41577f 100644
--- a/src/backend/gporca/libgpopt/include/gpopt/base/CQueryContext.h
+++ b/src/backend/gporca/libgpopt/include/gpopt/base/CQueryContext.h
@@ -144,7 +144,7 @@ public:
 
 #ifdef GPOS_DEBUG
 	// debug print
-	virtual IOstream &OsPrint(IOstream &) const;
+	IOstream &OsPrint(IOstream &) const;
 
 	void DbgPrint() const;
 #endif	// GPOS_DEBUG
diff --git a/src/backend/gporca/libgpopt/include/gpopt/search/CSearchStage.h b/src/backend/gporca/libgpopt/include/gpopt/search/CSearchStage.h
index 42b9b2ccb24a18b247d6da7cf770bd8873b366d9..406731e6ec295d6d5225cdc23ebe62e60762a5a4 100644
--- a/src/backend/gporca/libgpopt/include/gpopt/search/CSearchStage.h
+++ b/src/backend/gporca/libgpopt/include/gpopt/search/CSearchStage.h
@@ -139,7 +139,7 @@ public:
 	}
 
 	// print function
-	virtual IOstream &OsPrint(IOstream &) const;
+	IOstream &OsPrint(IOstream &) const;
 
 	// generate default search strategy
 	static CSearchStageArray *PdrgpssDefault(CMemoryPool *mp);
diff --git a/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrder.h b/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrder.h
index 3a0978eab16c06fc8bdf385a3402293d4df13090..e27ef8f83dbef343405688cf450ad24fe8d69967 100644
--- a/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrder.h
+++ b/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrder.h
@@ -237,7 +237,7 @@ public:
 	virtual ~CJoinOrder();
 
 	// print function
-	virtual IOstream &OsPrint(IOstream &) const;
+	IOstream &OsPrint(IOstream &) const;
 
 	// is this a valid join combination
 	BOOL IsValidJoinCombination(SComponent *comp1, SComponent *comp2) const;
diff --git a/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderDP.h b/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderDP.h
index e9ace99421de95f09be01950fa5d3ff121a2af3d..7ba39d30e4a1d581d29513518c3c547797f23b40 100644
--- a/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderDP.h
+++ b/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderDP.h
@@ -187,7 +187,7 @@ public:
 	}
 
 	// print function
-	IOstream &OsPrint(IOstream &) const override;
+	IOstream &OsPrint(IOstream &) const;
 
 #ifdef GPOS_DEBUG
 	void DbgPrint();
diff --git a/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderDPv2.h b/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderDPv2.h
index 9045e2fa5da128d3b887b74bfb629f2b9aeb3d36..adb664058b52c7f01d81f5c06caf8829974c9aa9 100644
--- a/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderDPv2.h
+++ b/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderDPv2.h
@@ -555,7 +555,7 @@ public:
 						   CBitSet **requiredBitsOnLeft = NULL);
 
 	// print function
-	IOstream &OsPrint(IOstream &) const override;
+	IOstream &OsPrint(IOstream &) const;
 
 	IOstream &OsPrintProperty(IOstream &, SExpressionProperties &) const;
 
diff --git a/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderMinCard.h b/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderMinCard.h
index b52c4cc337d8859c007993b3931e0d76ca81b0dd..dcf2737e9dcf81b809fe42a0b5a345d2f1598193 100644
--- a/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderMinCard.h
+++ b/src/backend/gporca/libgpopt/include/gpopt/xforms/CJoinOrderMinCard.h
@@ -47,7 +47,7 @@ public:
 	virtual CExpression *PexprExpand();
 
 	// print function
-	IOstream &OsPrint(IOstream &) const override;
+	IOstream &OsPrint(IOstream &) const;
 
 };	// class CJoinOrderMinCard
 
diff --git a/src/backend/gporca/libgpopt/src/xforms/CJoinOrder.cpp b/src/backend/gporca/libgpopt/src/xforms/CJoinOrder.cpp
index 32cd8cdfde2149ff1703304ad57922d7aa6e74da..28ffc9cdfbd5ca3fb819c1ef73d412ff6d2c7c3d 100644
--- a/src/backend/gporca/libgpopt/src/xforms/CJoinOrder.cpp
+++ b/src/backend/gporca/libgpopt/src/xforms/CJoinOrder.cpp
@@ -604,6 +604,8 @@ CJoinOrder::DeriveStats(CExpression *pexpr)
 //		Helper function to print a join order class
 //
 //---------------------------------------------------------------------------
+// FIXME: the following function is completely unused even for the purpose of
+// debugging, because all subclasses implement their own OsPrint
 IOstream &
 CJoinOrder::OsPrint(IOstream &os) const
 {
diff --git a/src/backend/gporca/libgpos/include/gpos/memory/CMemoryPool.h b/src/backend/gporca/libgpos/include/gpos/memory/CMemoryPool.h
index 4a01191aac7b6af5f2a0884ff44054c795c956a5..fff2022ab36a8482970b55ea3dddced397282e54 100644
--- a/src/backend/gporca/libgpos/include/gpos/memory/CMemoryPool.h
+++ b/src/backend/gporca/libgpos/include/gpos/memory/CMemoryPool.h
@@ -175,7 +175,7 @@ public:
 	}
 
 	// dump memory pool to given stream
-	virtual IOstream &OsPrint(IOstream &os);
+	IOstream &OsPrint(IOstream &os);
 
 	// check if a memory pool is empty
 	virtual void AssertEmpty(IOstream &os);
diff --git a/src/backend/gporca/libgpos/include/gpos/task/CTaskLocalStorageObject.h b/src/backend/gporca/libgpos/include/gpos/task/CTaskLocalStorageObject.h
index 012d3fc8fabc76bc0c5e6e28f3c3f49dbcb4e088..d7cd2d3e4825c23addfc0957972febd5d3135164 100644
--- a/src/backend/gporca/libgpos/include/gpos/task/CTaskLocalStorageObject.h
+++ b/src/backend/gporca/libgpos/include/gpos/task/CTaskLocalStorageObject.h
@@ -55,11 +55,6 @@ public:
 	// key
 	const CTaskLocalStorage::Etlsidx m_etlsidx;
 
-#ifdef GPOS_DEBUG
-	// debug print
-	virtual IOstream &OsPrint(IOstream &os) const = 0;
-#endif	// GPOS_DEBUG
-
 };	// class CTaskLocalStorageObject
 }  // namespace gpos
 
diff --git a/src/backend/gporca/libgpos/server/include/unittest/gpos/task/CTaskLocalStorageTest.h b/src/backend/gporca/libgpos/server/include/unittest/gpos/task/CTaskLocalStorageTest.h
index 39d82277ff9bed14802369b28d819ddc3fd0004b..2f2d01ad3b93d300d05003e366b632529dce1fa6 100644
--- a/src/backend/gporca/libgpos/server/include/unittest/gpos/task/CTaskLocalStorageTest.h
+++ b/src/backend/gporca/libgpos/server/include/unittest/gpos/task/CTaskLocalStorageTest.h
@@ -43,15 +43,6 @@ private:
 		CTestObject() : CTaskLocalStorageObject(CTaskLocalStorage::EtlsidxTest)
 		{
 		}
-
-#ifdef GPOS_DEBUG
-		// overwrite abstract member
-		IOstream &
-		OsPrint(IOstream &os) const override
-		{
-			return os;
-		}
-#endif	// GPOS_DEBUG
 	};
 
 public:
diff --git a/src/backend/gporca/libnaucrates/include/naucrates/statistics/CBucket.h b/src/backend/gporca/libnaucrates/include/naucrates/statistics/CBucket.h
index 4af7d4b84fb9b65a57ce2fc5d5be8a6864d8e66f..920c7594d76757125f5dab3030eb506d066d76c8 100644
--- a/src/backend/gporca/libnaucrates/include/naucrates/statistics/CBucket.h
+++ b/src/backend/gporca/libnaucrates/include/naucrates/statistics/CBucket.h
@@ -163,7 +163,7 @@ public:
 	BOOL IsAfter(const CBucket *bucket) const;
 
 	// print function
-	virtual IOstream &OsPrint(IOstream &os) const;
+	IOstream &OsPrint(IOstream &os) const;
 
 #ifdef GPOS_DEBUG
 	void DbgPrint() const;
diff --git a/src/backend/gporca/libnaucrates/include/naucrates/statistics/CHistogram.h b/src/backend/gporca/libnaucrates/include/naucrates/statistics/CHistogram.h
index 83ccbf5eed2ee03206818f0072bf242b141e8333..f57f1aef716b3ce0f2b0560a3e0999c7c1076ab3 100644
--- a/src/backend/gporca/libnaucrates/include/naucrates/statistics/CHistogram.h
+++ b/src/backend/gporca/libnaucrates/include/naucrates/statistics/CHistogram.h
@@ -341,7 +341,7 @@ public:
 	}
 
 	// print function
-	virtual IOstream &OsPrint(IOstream &os) const;
+	IOstream &OsPrint(IOstream &os) const;
 
 #ifdef GPOS_DEBUG
 	void DbgPrint() const;