diff --git a/src/backend/columnar/columnar_debug.c b/src/backend/columnar/columnar_debug.c
index 220d259fe..e6b19f768 100644
--- a/src/backend/columnar/columnar_debug.c
+++ b/src/backend/columnar/columnar_debug.c
@@ -115,8 +115,6 @@ columnar_storage_info(PG_FUNCTION_ARGS)
 							   RelationGetRelationName(rel))));
 	}
 
-	RelationOpenSmgr(rel);
-
 	Datum values[STORAGE_INFO_NATTS] = { 0 };
 	bool nulls[STORAGE_INFO_NATTS] = { 0 };
 
diff --git a/src/backend/columnar/columnar_metadata.c b/src/backend/columnar/columnar_metadata.c
index 62d64861f..ccea52b6d 100644
--- a/src/backend/columnar/columnar_metadata.c
+++ b/src/backend/columnar/columnar_metadata.c
@@ -1738,11 +1738,10 @@ ColumnarStorageUpdateIfNeeded(Relation rel, bool isUpgrade)
 		return;
 	}
 
-	RelationOpenSmgr(rel);
-	BlockNumber nblocks = smgrnblocks(rel->rd_smgr, MAIN_FORKNUM);
+	BlockNumber nblocks = smgrnblocks(RelationGetSmgr(rel), MAIN_FORKNUM);
 	if (nblocks < 2)
 	{
-		ColumnarStorageInit(rel->rd_smgr, ColumnarMetadataNewStorageId());
+		ColumnarStorageInit(RelationGetSmgr(rel), ColumnarMetadataNewStorageId());
 		return;
 	}
 
diff --git a/src/backend/columnar/columnar_storage.c b/src/backend/columnar/columnar_storage.c
index 71fc75ccb..9712e7160 100644
--- a/src/backend/columnar/columnar_storage.c
+++ b/src/backend/columnar/columnar_storage.c
@@ -44,6 +44,8 @@
 #include "storage/bufmgr.h"
 #include "storage/lmgr.h"
 
+#include "pg_version_compat.h"
+
 #include "columnar/columnar.h"
 #include "columnar/columnar_storage.h"
 
@@ -354,8 +356,7 @@ ColumnarStorageGetReservedOffset(Relation rel, bool force)
 bool
 ColumnarStorageIsCurrent(Relation rel)
 {
-	RelationOpenSmgr(rel);
-	BlockNumber nblocks = smgrnblocks(rel->rd_smgr, MAIN_FORKNUM);
+	BlockNumber nblocks = smgrnblocks(RelationGetSmgr(rel), MAIN_FORKNUM);
 
 	if (nblocks < 2)
 	{
@@ -439,8 +440,7 @@ ColumnarStorageReserveData(Relation rel, uint64 amount)
 	PhysicalAddr final = LogicalToPhysical(nextReservation - 1);
 
 	/* extend with new pages */
-	RelationOpenSmgr(rel);
-	BlockNumber nblocks = smgrnblocks(rel->rd_smgr, MAIN_FORKNUM);
+	BlockNumber nblocks = smgrnblocks(RelationGetSmgr(rel), MAIN_FORKNUM);
 
 	while (nblocks <= final.blockno)
 	{
@@ -547,8 +547,7 @@ ColumnarStorageTruncate(Relation rel, uint64 newDataReservation)
 			 rel->rd_id, newDataReservation);
 	}
 
-	RelationOpenSmgr(rel);
-	BlockNumber old_rel_pages = smgrnblocks(rel->rd_smgr, MAIN_FORKNUM);
+	BlockNumber old_rel_pages = smgrnblocks(RelationGetSmgr(rel), MAIN_FORKNUM);
 	if (old_rel_pages == 0)
 	{
 		/* nothing to do */
@@ -627,8 +626,7 @@ ColumnarOverwriteMetapage(Relation relation, ColumnarMetapage columnarMetapage)
 static ColumnarMetapage
 ColumnarMetapageRead(Relation rel, bool force)
 {
-	RelationOpenSmgr(rel);
-	BlockNumber nblocks = smgrnblocks(rel->rd_smgr, MAIN_FORKNUM);
+	BlockNumber nblocks = smgrnblocks(RelationGetSmgr(rel), MAIN_FORKNUM);
 	if (nblocks == 0)
 	{
 		/*
diff --git a/src/backend/columnar/columnar_tableam.c b/src/backend/columnar/columnar_tableam.c
index b6179ac8c..e64b7613e 100644
--- a/src/backend/columnar/columnar_tableam.c
+++ b/src/backend/columnar/columnar_tableam.c
@@ -913,8 +913,7 @@ columnar_relation_nontransactional_truncate(Relation rel)
 	RelationTruncate(rel, 0);
 
 	uint64 storageId = ColumnarMetadataNewStorageId();
-	RelationOpenSmgr(rel);
-	ColumnarStorageInit(rel->rd_smgr, storageId);
+	ColumnarStorageInit(RelationGetSmgr(rel), storageId);
 }
 
 
@@ -1136,8 +1135,7 @@ LogRelationStats(Relation rel, int elevel)
 		totalStripeLength += stripe->dataLength;
 	}
 
-	RelationOpenSmgr(rel);
-	uint64 relPages = smgrnblocks(rel->rd_smgr, MAIN_FORKNUM);
+	uint64 relPages = smgrnblocks(RelationGetSmgr(rel), MAIN_FORKNUM);
 	RelationCloseSmgr(rel);
 
 	Datum storageId = DirectFunctionCall1(columnar_relation_storageid,
@@ -1239,8 +1237,7 @@ TruncateColumnar(Relation rel, int elevel)
 	uint64 newDataReservation = Max(GetHighestUsedAddress(rel->rd_node) + 1,
 									ColumnarFirstLogicalOffset);
 
-	RelationOpenSmgr(rel);
-	BlockNumber old_rel_pages = smgrnblocks(rel->rd_smgr, MAIN_FORKNUM);
+	BlockNumber old_rel_pages = smgrnblocks(RelationGetSmgr(rel), MAIN_FORKNUM);
 
 	if (!ColumnarStorageTruncate(rel, newDataReservation))
 	{
@@ -1248,8 +1245,7 @@ TruncateColumnar(Relation rel, int elevel)
 		return;
 	}
 
-	RelationOpenSmgr(rel);
-	BlockNumber new_rel_pages = smgrnblocks(rel->rd_smgr, MAIN_FORKNUM);
+	BlockNumber new_rel_pages = smgrnblocks(RelationGetSmgr(rel), MAIN_FORKNUM);
 
 	/*
 	 * We can release the exclusive lock as soon as we have truncated.
@@ -1784,20 +1780,17 @@ columnar_relation_size(Relation rel, ForkNumber forkNumber)
 
 	uint64 nblocks = 0;
 
-	/* Open it at the smgr level if not already done */
-	RelationOpenSmgr(rel);
-
 	/* InvalidForkNumber indicates returning the size for all forks */
 	if (forkNumber == InvalidForkNumber)
 	{
 		for (int i = 0; i < MAX_FORKNUM; i++)
 		{
-			nblocks += smgrnblocks(rel->rd_smgr, i);
+			nblocks += smgrnblocks(RelationGetSmgr(rel), i);
 		}
 	}
 	else
 	{
-		nblocks = smgrnblocks(rel->rd_smgr, forkNumber);
+		nblocks = smgrnblocks(RelationGetSmgr(rel), forkNumber);
 	}
 
 	return nblocks * BLCKSZ;
@@ -1819,8 +1812,7 @@ columnar_estimate_rel_size(Relation rel, int32 *attr_widths,
 						   double *allvisfrac)
 {
 	CheckCitusColumnarVersion(ERROR);
-	RelationOpenSmgr(rel);
-	*pages = smgrnblocks(rel->rd_smgr, MAIN_FORKNUM);
+	*pages = smgrnblocks(RelationGetSmgr(rel), MAIN_FORKNUM);
 	*tuples = ColumnarTableRowCount(rel);
 
 	/*
diff --git a/src/backend/distributed/test/fake_am.c b/src/backend/distributed/test/fake_am.c
index ce7784510..63d5a69fe 100644
--- a/src/backend/distributed/test/fake_am.c
+++ b/src/backend/distributed/test/fake_am.c
@@ -20,6 +20,7 @@
 #include "postgres.h"
 
 #include "distributed/pg_version_constants.h"
+#include "pg_version_compat.h"
 
 
 #include "access/amapi.h"
@@ -446,20 +447,17 @@ fake_relation_size(Relation rel, ForkNumber forkNumber)
 
 	uint64 nblocks = 0;
 
-	/* Open it at the smgr level if not already done */
-	RelationOpenSmgr(rel);
-
 	/* InvalidForkNumber indicates returning the size for all forks */
 	if (forkNumber == InvalidForkNumber)
 	{
 		for (int i = 0; i < MAX_FORKNUM; i++)
 		{
-			nblocks += smgrnblocks(rel->rd_smgr, i);
+			nblocks += smgrnblocks(RelationGetSmgr(rel), i);
 		}
 	}
 	else
 	{
-		nblocks = smgrnblocks(rel->rd_smgr, forkNumber);
+		nblocks = smgrnblocks(RelationGetSmgr(rel), forkNumber);
 	}
 
 	return nblocks * BLCKSZ;
diff --git a/src/include/pg_version_compat.h b/src/include/pg_version_compat.h
index ad7a8bbb0..e298138d9 100644
--- a/src/include/pg_version_compat.h
+++ b/src/include/pg_version_compat.h
@@ -13,6 +13,25 @@
 
 #include "distributed/pg_version_constants.h"
 
+#if PG_VERSION_NUM >= PG_VERSION_15
+#else
+
+#include "storage/smgr.h"
+#include "utils/rel.h"
+
+static inline SMgrRelation
+RelationGetSmgr(Relation rel)
+{
+	if (unlikely(rel->rd_smgr == NULL))
+	{
+		smgrsetowner(&(rel->rd_smgr), smgropen(rel->rd_node, rel->rd_backend));
+	}
+	return rel->rd_smgr;
+}
+
+
+#endif
+
 #if PG_VERSION_NUM >= PG_VERSION_14
 #define AlterTableStmtObjType_compat(a) ((a)->objtype)
 #define getObjectTypeDescription_compat(a, b) getObjectTypeDescription(a, b)