v25-0006-Support-the-conflict-detection-for-update_delete.patch

From 8fca37b7858ec47f5e17931bc2f36d28272256fc Mon Sep 17 00:00:00 2001
From: Hou Zhijie <houzj.fnst@cn.fujitsu.com>
Date: Wed, 8 Jan 2025 15:48:14 +0800
Subject: [PATCH v25 6/6] Support the conflict detection for update_deleted

This patch supports detecting update_deleted conflicts during update
operations. If the target row cannot be found when applying update operations,
we perform an additional scan of the table using snapshotAny. This scan aims to
locate the most recently deleted row that matches the old column values from
the remote update operation and has not yet been removed by VACUUM. If any such
tuples are found, we report the update_deleted conflict along with the origin
and transaction information that deleted the tuple.
---
 doc/src/sgml/logical-replication.sgml         |  15 ++
 doc/src/sgml/monitoring.sgml                  |  11 ++
 src/backend/catalog/system_views.sql          |   1 +
 src/backend/executor/execReplication.c        | 138 +++++++++++++++++-
 src/backend/replication/logical/conflict.c    |  22 +++
 src/backend/replication/logical/worker.c      |  61 +++++---
 src/backend/utils/adt/pgstatfuncs.c           |  16 +-
 src/include/catalog/pg_proc.dat               |   6 +-
 src/include/executor/executor.h               |   7 +-
 src/include/replication/conflict.h            |   3 +
 src/test/regress/expected/rules.out           |   3 +-
 .../t/035_retain_conflict_info.pl             |  23 ++-
 12 files changed, 265 insertions(+), 41 deletions(-)

diff --git a/doc/src/sgml/logical-replication.sgml b/doc/src/sgml/logical-replication.sgml
index 05790396755..f1891e9f21f 100644
--- a/doc/src/sgml/logical-replication.sgml
+++ b/doc/src/sgml/logical-replication.sgml
@@ -1626,6 +1626,21 @@ test_sub=# SELECT * FROM t1 ORDER BY id;
       </para>
      </listitem>
     </varlistentry>
+    <varlistentry id="conflict-update-deleted" xreflabel="update_deleted">
+     <term><literal>update_deleted</literal></term>
+     <listitem>
+      <para>
+       The tuple to be updated was deleted by another origin. The update will
+       simply be skipped in this scenario.
+       Note that this conflict can only be detected when
+       <xref linkend="guc-track-commit-timestamp"/>
+       and <link linkend="sql-createsubscription-params-with-retain-conflict-info"><literal>retain_conflict_info</literal></link>
+       are enabled. Note that if a tuple cannot be found due to the table being
+       truncated only a <literal>update_missing</literal> conflict will arise.
+       arise
+      </para>
+     </listitem>
+    </varlistentry>
     <varlistentry id="conflict-update-origin-differs" xreflabel="update_origin_differs">
      <term><literal>update_origin_differs</literal></term>
      <listitem>
diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index c1c61e2ed6c..12f21c521f8 100644
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -2199,6 +2199,17 @@ description | Waiting for a newly initialized WAL file to reach durable storage
       </para></entry>
      </row>
 
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>confl_update_deleted</structfield> <type>bigint</type>
+      </para>
+      <para>
+       Number of times the tuple to be updated was deleted by another origin
+       during the application of changes. See <xref linkend="conflict-update-deleted"/>
+       for details about this conflict.
+      </para></entry>
+     </row>
+
      <row>
       <entry role="catalog_table_entry"><para role="column_definition">
        <structfield>confl_update_origin_differs</structfield> <type>bigint</type>
diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index 523bca04957..e8bcc30c9ad 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -1379,6 +1379,7 @@ CREATE VIEW pg_stat_subscription_stats AS
         ss.apply_error_count,
         ss.sync_error_count,
         ss.confl_insert_exists,
+        ss.confl_update_deleted,
         ss.confl_update_origin_differs,
         ss.confl_update_exists,
         ss.confl_update_missing,
diff --git a/src/backend/executor/execReplication.c b/src/backend/executor/execReplication.c
index 3985e84d3a6..ecb81c202c2 100644
--- a/src/backend/executor/execReplication.c
+++ b/src/backend/executor/execReplication.c
@@ -14,12 +14,14 @@
 
 #include "postgres.h"
 
+#include "access/commit_ts.h"
 #include "access/genam.h"
 #include "access/gist.h"
 #include "access/relscan.h"
 #include "access/tableam.h"
 #include "access/transam.h"
 #include "access/xact.h"
+#include "access/heapam.h"
 #include "catalog/pg_am_d.h"
 #include "commands/trigger.h"
 #include "executor/executor.h"
@@ -27,6 +29,7 @@
 #include "replication/conflict.h"
 #include "replication/logicalrelation.h"
 #include "storage/lmgr.h"
+#include "storage/procarray.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"
 #include "utils/rel.h"
@@ -36,7 +39,7 @@
 
 
 static bool tuples_equal(TupleTableSlot *slot1, TupleTableSlot *slot2,
-						 TypeCacheEntry **eq);
+						 TypeCacheEntry **eq, Bitmapset *columns);
 
 /*
  * Returns the fixed strategy number, if any, of the equality operator for the
@@ -253,7 +256,7 @@ retry:
 			if (eq == NULL)
 				eq = palloc0(sizeof(*eq) * outslot->tts_tupleDescriptor->natts);
 
-			if (!tuples_equal(outslot, searchslot, eq))
+			if (!tuples_equal(outslot, searchslot, eq, NULL))
 				continue;
 		}
 
@@ -309,10 +312,13 @@ retry:
 
 /*
  * Compare the tuples in the slots by checking if they have equal values.
+ *
+ * If 'columns' is not null, only the columns specified within it will be
+ * considered for the equality check, ignoring all other columns.
  */
 static bool
 tuples_equal(TupleTableSlot *slot1, TupleTableSlot *slot2,
-			 TypeCacheEntry **eq)
+			 TypeCacheEntry **eq, Bitmapset *columns)
 {
 	int			attrnum;
 
@@ -337,6 +343,14 @@ tuples_equal(TupleTableSlot *slot1, TupleTableSlot *slot2,
 		if (att->attisdropped || att->attgenerated)
 			continue;
 
+		/*
+		 * Ignore columns that are not listed for checking.
+		 */
+		if (columns &&
+			!bms_is_member(att->attnum - FirstLowInvalidHeapAttributeNumber,
+						   columns))
+			continue;
+
 		/*
 		 * If one value is NULL and other is not, then they are certainly not
 		 * equal
@@ -412,7 +426,7 @@ retry:
 	/* Try to find the tuple */
 	while (table_scan_getnextslot(scan, ForwardScanDirection, scanslot))
 	{
-		if (!tuples_equal(scanslot, searchslot, eq))
+		if (!tuples_equal(scanslot, searchslot, eq, NULL))
 			continue;
 
 		found = true;
@@ -463,6 +477,122 @@ retry:
 	return found;
 }
 
+/*
+ * Searches the relation 'rel' for the most recently deleted tuple that matches
+ * the values in 'searchslot' and is not yet removable by VACUUM. The function
+ * returns the transaction ID, origin, and commit timestamp of the transaction
+ * that deleted this tuple.
+ *
+ * The commit timestamp of the transaction that deleted the tuple is used to
+ * determine whether the tuple is the most recently deleted one.
+ *
+ * This function performs a full table scan instead of using indexes because
+ * index scans could miss deleted tuples if an index has been re-indexed or
+ * re-created during change applications. While this approach may be slow on
+ * large tables, it is considered acceptable because it is only used in rare
+ * conflict cases where the target row for an update cannot be found.
+ */
+bool
+FindMostRecentlyDeletedTupleInfo(Relation rel, TupleTableSlot *searchslot,
+								 TransactionId *delete_xid,
+								 RepOriginId *delete_origin,
+								 TimestampTz *delete_time)
+{
+	TupleTableSlot *scanslot;
+	TableScanDesc scan;
+	TypeCacheEntry **eq;
+	TransactionId oldestXmin;
+	BufferHeapTupleTableSlot *hslot;
+	HeapTuple	tuple;
+	Buffer		buf;
+	Bitmapset  *indexbitmap;
+	TupleDesc	desc PG_USED_FOR_ASSERTS_ONLY = RelationGetDescr(rel);
+
+	Assert(equalTupleDescs(desc, searchslot->tts_tupleDescriptor));
+
+	*delete_xid = InvalidTransactionId;
+	*delete_origin = InvalidRepOriginId;
+	*delete_time = 0;
+
+	/* Exit early if the commit timestamp data is not available */
+	if (!track_commit_timestamp)
+		return false;
+
+	/* Get the cutoff xmin for HeapTupleSatisfiesVacuum */
+	oldestXmin = GetOldestNonRemovableTransactionId(rel);
+
+	/* Get the index column bitmap for tuples_equal */
+	indexbitmap = RelationGetIndexAttrBitmap(rel,
+											 INDEX_ATTR_BITMAP_IDENTITY_KEY);
+
+	/* fallback to PK if no replica identity */
+	if (!indexbitmap)
+		indexbitmap = RelationGetIndexAttrBitmap(rel,
+												 INDEX_ATTR_BITMAP_PRIMARY_KEY);
+
+	eq = palloc0(sizeof(*eq) * searchslot->tts_tupleDescriptor->natts);
+
+	/*
+	 * Start a heap scan using SnapshotAny to identify dead tuples that are
+	 * not visible under a standard MVCC snapshot.
+	 */
+	scan = table_beginscan(rel, SnapshotAny, 0, NULL);
+	scanslot = table_slot_create(rel, NULL);
+	hslot = (BufferHeapTupleTableSlot *) scanslot;
+
+	table_rescan(scan, NULL);
+
+	/* Try to find the tuple */
+	while (table_scan_getnextslot(scan, ForwardScanDirection, scanslot))
+	{
+		bool		dead = false;
+		TransactionId xmax;
+		TimestampTz localts;
+		RepOriginId localorigin;
+
+		if (!tuples_equal(scanslot, searchslot, eq, indexbitmap))
+			continue;
+
+		tuple = ExecFetchSlotHeapTuple(scanslot, false, NULL);
+		buf = hslot->buffer;
+
+		LockBuffer(buf, BUFFER_LOCK_SHARE);
+
+		/*
+		 * We do not consider HEAPTUPLE_DEAD status because it indicates
+		 * either tuples whose inserting transaction was aborted, meaning
+		 * there is no commit timestamp or origin, or tuples deleted by a
+		 * transaction older than oldestXmin, making it safe to ignore them
+		 * during conflict detection (See comments atop
+		 * maybe_advance_nonremovable_xid() for details).
+		 */
+		if (HeapTupleSatisfiesVacuum(tuple, oldestXmin, buf) == HEAPTUPLE_RECENTLY_DEAD)
+			dead = true;
+
+		LockBuffer(buf, BUFFER_LOCK_UNLOCK);
+
+		if (!dead)
+			continue;
+
+		xmax = HeapTupleHeaderGetUpdateXid(tuple->t_data);
+
+		/* Select the dead tuple with the most recent commit timestamp */
+		if (TransactionIdGetCommitTsData(xmax, &localts, &localorigin) &&
+			(TimestampDifferenceExceeds(*delete_time, localts, 0) ||
+			 *delete_time == 0))
+		{
+			*delete_xid = xmax;
+			*delete_time = localts;
+			*delete_origin = localorigin;
+		}
+	}
+
+	table_endscan(scan);
+	ExecDropSingleTupleTableSlot(scanslot);
+
+	return *delete_time != 0;
+}
+
 /*
  * Find the tuple that violates the passed unique index (conflictindex).
  *
diff --git a/src/backend/replication/logical/conflict.c b/src/backend/replication/logical/conflict.c
index 772fc83e88b..0eedbd2b163 100644
--- a/src/backend/replication/logical/conflict.c
+++ b/src/backend/replication/logical/conflict.c
@@ -25,6 +25,7 @@
 
 static const char *const ConflictTypeNames[] = {
 	[CT_INSERT_EXISTS] = "insert_exists",
+	[CT_UPDATE_DELETED] = "update_deleted",
 	[CT_UPDATE_ORIGIN_DIFFERS] = "update_origin_differs",
 	[CT_UPDATE_EXISTS] = "update_exists",
 	[CT_UPDATE_MISSING] = "update_missing",
@@ -170,6 +171,7 @@ errcode_apply_conflict(ConflictType type)
 		case CT_INSERT_EXISTS:
 		case CT_UPDATE_EXISTS:
 			return errcode(ERRCODE_UNIQUE_VIOLATION);
+		case CT_UPDATE_DELETED:
 		case CT_UPDATE_ORIGIN_DIFFERS:
 		case CT_UPDATE_MISSING:
 		case CT_DELETE_ORIGIN_DIFFERS:
@@ -240,6 +242,26 @@ errdetail_apply_conflict(EState *estate, ResultRelInfo *relinfo,
 
 			break;
 
+		case CT_UPDATE_DELETED:
+			if (localts)
+			{
+				if (localorigin == InvalidRepOriginId)
+					appendStringInfo(&err_detail, _("The row to be updated was deleted locally in transaction %u at %s."),
+									 localxmin, timestamptz_to_str(localts));
+				else if (replorigin_by_oid(localorigin, true, &origin_name))
+					appendStringInfo(&err_detail, _("The row to be updated was deleted by a different origin \"%s\" in transaction %u at %s."),
+									 origin_name, localxmin, timestamptz_to_str(localts));
+
+				/* The origin that modified this row has been removed. */
+				else
+					appendStringInfo(&err_detail, _("The row to be updated was deleted by a non-existent origin in transaction %u at %s."),
+									 localxmin, timestamptz_to_str(localts));
+			}
+			else
+				appendStringInfo(&err_detail, _("The row to be updated was deleted."));
+
+			break;
+
 		case CT_UPDATE_ORIGIN_DIFFERS:
 			if (localorigin == InvalidRepOriginId)
 				appendStringInfo(&err_detail, _("Updating the row that was modified locally in transaction %u at %s."),
diff --git a/src/backend/replication/logical/worker.c b/src/backend/replication/logical/worker.c
index a748cb2eab4..83e845c6e6e 100644
--- a/src/backend/replication/logical/worker.c
+++ b/src/backend/replication/logical/worker.c
@@ -2746,6 +2746,9 @@ apply_handle_update_internal(ApplyExecutionData *edata,
 	TupleTableSlot *localslot;
 	bool		found;
 	MemoryContext oldctx;
+	RepOriginId localorigin = InvalidRepOriginId;
+	TransactionId localxid = InvalidTransactionId;
+	TimestampTz localts = 0;
 
 	EvalPlanQualInit(&epqstate, estate, NULL, NIL, -1, NIL);
 	ExecOpenIndices(relinfo, true);
@@ -2762,15 +2765,11 @@ apply_handle_update_internal(ApplyExecutionData *edata,
 	 */
 	if (found)
 	{
-		RepOriginId localorigin;
-		TransactionId localxmin;
-		TimestampTz localts;
-
 		/*
 		 * Report the conflict if the tuple was modified by a different
 		 * origin.
 		 */
-		if (GetTupleTransactionInfo(localslot, &localxmin, &localorigin, &localts) &&
+		if (GetTupleTransactionInfo(localslot, &localxid, &localorigin, &localts) &&
 			localorigin != replorigin_session_origin)
 		{
 			TupleTableSlot *newslot;
@@ -2781,7 +2780,7 @@ apply_handle_update_internal(ApplyExecutionData *edata,
 
 			ReportApplyConflict(estate, relinfo, LOG, CT_UPDATE_ORIGIN_DIFFERS,
 								remoteslot, localslot, newslot,
-								InvalidOid, localxmin, localorigin, localts);
+								InvalidOid, localxid, localorigin, localts);
 		}
 
 		/* Process and store remote tuple in the slot */
@@ -2800,19 +2799,28 @@ apply_handle_update_internal(ApplyExecutionData *edata,
 	}
 	else
 	{
+		ConflictType type;
 		TupleTableSlot *newslot = localslot;
 
+		if (MySubscription->retainconflictinfo &&
+			FindMostRecentlyDeletedTupleInfo(localrel, remoteslot,
+											 &localxid, &localorigin,
+											 &localts) &&
+			localorigin != replorigin_session_origin)
+			type = CT_UPDATE_DELETED;
+		else
+			type = CT_UPDATE_MISSING;
+
 		/* Store the new tuple for conflict reporting */
 		slot_store_data(newslot, relmapentry, newtup);
 
 		/*
-		 * The tuple to be updated could not be found.  Do nothing except for
-		 * emitting a log message.
+		 * The tuple to be updated could not be found or was deleted.  Do
+		 * nothing except for emitting a log message.
 		 */
-		ReportApplyConflict(estate, relinfo, LOG, CT_UPDATE_MISSING,
+		ReportApplyConflict(estate, relinfo, LOG, type,
 							remoteslot, NULL, newslot,
-							InvalidOid, InvalidTransactionId,
-							InvalidRepOriginId, 0);
+							InvalidOid, localxid, localorigin, localts);
 	}
 
 	/* Cleanup. */
@@ -3133,9 +3141,9 @@ apply_handle_tuple_routing(ApplyExecutionData *edata,
 				Relation	partrel_new;
 				bool		found;
 				EPQState	epqstate;
-				RepOriginId localorigin;
-				TransactionId localxmin;
-				TimestampTz localts;
+				RepOriginId localorigin = InvalidRepOriginId;
+				TransactionId localxid = InvalidTransactionId;
+				TimestampTz localts = 0;
 
 				/* Get the matching local tuple from the partition. */
 				found = FindReplTupleInLocalRel(edata, partrel,
@@ -3144,20 +3152,29 @@ apply_handle_tuple_routing(ApplyExecutionData *edata,
 												remoteslot_part, &localslot);
 				if (!found)
 				{
+					ConflictType type;
 					TupleTableSlot *newslot = localslot;
 
+					if (MySubscription->retainconflictinfo &&
+						FindMostRecentlyDeletedTupleInfo(partrel, remoteslot_part,
+														 &localxid, &localorigin,
+														 &localts) &&
+						localorigin != replorigin_session_origin)
+						type = CT_UPDATE_DELETED;
+					else
+						type = CT_UPDATE_MISSING;
+
 					/* Store the new tuple for conflict reporting */
 					slot_store_data(newslot, part_entry, newtup);
 
 					/*
-					 * The tuple to be updated could not be found.  Do nothing
-					 * except for emitting a log message.
+					 * The tuple to be updated could not be found or was
+					 * deleted.  Do nothing except for emitting a log message.
 					 */
-					ReportApplyConflict(estate, partrelinfo,
-										LOG, CT_UPDATE_MISSING,
+					ReportApplyConflict(estate, partrelinfo, LOG, type,
 										remoteslot_part, NULL, newslot,
-										InvalidOid, InvalidTransactionId,
-										InvalidRepOriginId, 0);
+										InvalidOid, localxid,
+										localorigin, localts);
 
 					return;
 				}
@@ -3166,7 +3183,7 @@ apply_handle_tuple_routing(ApplyExecutionData *edata,
 				 * Report the conflict if the tuple was modified by a
 				 * different origin.
 				 */
-				if (GetTupleTransactionInfo(localslot, &localxmin, &localorigin, &localts) &&
+				if (GetTupleTransactionInfo(localslot, &localxid, &localorigin, &localts) &&
 					localorigin != replorigin_session_origin)
 				{
 					TupleTableSlot *newslot;
@@ -3177,7 +3194,7 @@ apply_handle_tuple_routing(ApplyExecutionData *edata,
 
 					ReportApplyConflict(estate, partrelinfo, LOG, CT_UPDATE_ORIGIN_DIFFERS,
 										remoteslot_part, localslot, newslot,
-										InvalidOid, localxmin, localorigin,
+										InvalidOid, localxid, localorigin,
 										localts);
 				}
 
diff --git a/src/backend/utils/adt/pgstatfuncs.c b/src/backend/utils/adt/pgstatfuncs.c
index 0f5e0a9778d..1b6436324a2 100644
--- a/src/backend/utils/adt/pgstatfuncs.c
+++ b/src/backend/utils/adt/pgstatfuncs.c
@@ -2131,7 +2131,7 @@ pg_stat_get_replication_slot(PG_FUNCTION_ARGS)
 Datum
 pg_stat_get_subscription_stats(PG_FUNCTION_ARGS)
 {
-#define PG_STAT_GET_SUBSCRIPTION_STATS_COLS	10
+#define PG_STAT_GET_SUBSCRIPTION_STATS_COLS	11
 	Oid			subid = PG_GETARG_OID(0);
 	TupleDesc	tupdesc;
 	Datum		values[PG_STAT_GET_SUBSCRIPTION_STATS_COLS] = {0};
@@ -2153,17 +2153,19 @@ pg_stat_get_subscription_stats(PG_FUNCTION_ARGS)
 					   INT8OID, -1, 0);
 	TupleDescInitEntry(tupdesc, (AttrNumber) 4, "confl_insert_exists",
 					   INT8OID, -1, 0);
-	TupleDescInitEntry(tupdesc, (AttrNumber) 5, "confl_update_origin_differs",
+	TupleDescInitEntry(tupdesc, (AttrNumber) 5, "confl_update_deleted",
 					   INT8OID, -1, 0);
-	TupleDescInitEntry(tupdesc, (AttrNumber) 6, "confl_update_exists",
+	TupleDescInitEntry(tupdesc, (AttrNumber) 6, "confl_update_origin_differs",
 					   INT8OID, -1, 0);
-	TupleDescInitEntry(tupdesc, (AttrNumber) 7, "confl_update_missing",
+	TupleDescInitEntry(tupdesc, (AttrNumber) 7, "confl_update_exists",
 					   INT8OID, -1, 0);
-	TupleDescInitEntry(tupdesc, (AttrNumber) 8, "confl_delete_origin_differs",
+	TupleDescInitEntry(tupdesc, (AttrNumber) 8, "confl_update_missing",
 					   INT8OID, -1, 0);
-	TupleDescInitEntry(tupdesc, (AttrNumber) 9, "confl_delete_missing",
+	TupleDescInitEntry(tupdesc, (AttrNumber) 9, "confl_delete_origin_differs",
 					   INT8OID, -1, 0);
-	TupleDescInitEntry(tupdesc, (AttrNumber) 10, "stats_reset",
+	TupleDescInitEntry(tupdesc, (AttrNumber) 10, "confl_delete_missing",
+					   INT8OID, -1, 0);
+	TupleDescInitEntry(tupdesc, (AttrNumber) 11, "stats_reset",
 					   TIMESTAMPTZOID, -1, 0);
 	BlessTupleDesc(tupdesc);
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 98ee6513f91..f938ccbcd0a 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -5600,9 +5600,9 @@
 { oid => '6231', descr => 'statistics: information about subscription stats',
   proname => 'pg_stat_get_subscription_stats', provolatile => 's',
   proparallel => 'r', prorettype => 'record', proargtypes => 'oid',
-  proallargtypes => '{oid,oid,int8,int8,int8,int8,int8,int8,int8,int8,timestamptz}',
-  proargmodes => '{i,o,o,o,o,o,o,o,o,o,o}',
-  proargnames => '{subid,subid,apply_error_count,sync_error_count,confl_insert_exists,confl_update_origin_differs,confl_update_exists,confl_update_missing,confl_delete_origin_differs,confl_delete_missing,stats_reset}',
+  proallargtypes => '{oid,oid,int8,int8,int8,int8,int8,int8,int8,int8,int8,timestamptz}',
+  proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o}',
+  proargnames => '{subid,subid,apply_error_count,sync_error_count,confl_insert_exists,confl_update_deleted,confl_update_origin_differs,confl_update_exists,confl_update_missing,confl_delete_origin_differs,confl_delete_missing,stats_reset}',
   prosrc => 'pg_stat_get_subscription_stats' },
 { oid => '6118', descr => 'statistics: information about subscription',
   proname => 'pg_stat_get_subscription', prorows => '10', proisstrict => 'f',
diff --git a/src/include/executor/executor.h b/src/include/executor/executor.h
index c7db6defd3e..8af7ce4ce38 100644
--- a/src/include/executor/executor.h
+++ b/src/include/executor/executor.h
@@ -14,6 +14,7 @@
 #ifndef EXECUTOR_H
 #define EXECUTOR_H
 
+#include "datatype/timestamp.h"
 #include "executor/execdesc.h"
 #include "fmgr.h"
 #include "nodes/lockoptions.h"
@@ -671,7 +672,11 @@ extern bool RelationFindReplTupleByIndex(Relation rel, Oid idxoid,
 										 TupleTableSlot *outslot);
 extern bool RelationFindReplTupleSeq(Relation rel, LockTupleMode lockmode,
 									 TupleTableSlot *searchslot, TupleTableSlot *outslot);
-
+extern bool FindMostRecentlyDeletedTupleInfo(Relation rel,
+											 TupleTableSlot *searchslot,
+											 TransactionId *delete_xid,
+											 RepOriginId *delete_origin,
+											 TimestampTz *delete_time);
 extern void ExecSimpleRelationInsert(ResultRelInfo *resultRelInfo,
 									 EState *estate, TupleTableSlot *slot);
 extern void ExecSimpleRelationUpdate(ResultRelInfo *resultRelInfo,
diff --git a/src/include/replication/conflict.h b/src/include/replication/conflict.h
index 37454dc9513..91224b6ea60 100644
--- a/src/include/replication/conflict.h
+++ b/src/include/replication/conflict.h
@@ -26,6 +26,9 @@ typedef enum
 	/* The row to be inserted violates unique constraint */
 	CT_INSERT_EXISTS,
 
+	/* The row to be updated was deleted by a different origin */
+	CT_UPDATE_DELETED,
+
 	/* The row to be updated was modified by a different origin */
 	CT_UPDATE_ORIGIN_DIFFERS,
 
diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index 12b92e3826c..5d05584816d 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -2147,6 +2147,7 @@ pg_stat_subscription_stats| SELECT ss.subid,
     ss.apply_error_count,
     ss.sync_error_count,
     ss.confl_insert_exists,
+    ss.confl_update_deleted,
     ss.confl_update_origin_differs,
     ss.confl_update_exists,
     ss.confl_update_missing,
@@ -2154,7 +2155,7 @@ pg_stat_subscription_stats| SELECT ss.subid,
     ss.confl_delete_missing,
     ss.stats_reset
    FROM pg_subscription s,
-    LATERAL pg_stat_get_subscription_stats(s.oid) ss(subid, apply_error_count, sync_error_count, confl_insert_exists, confl_update_origin_differs, confl_update_exists, confl_update_missing, confl_delete_origin_differs, confl_delete_missing, stats_reset);
+    LATERAL pg_stat_get_subscription_stats(s.oid) ss(subid, apply_error_count, sync_error_count, confl_insert_exists, confl_update_deleted, confl_update_origin_differs, confl_update_exists, confl_update_missing, confl_delete_origin_differs, confl_delete_missing, stats_reset);
 pg_stat_sys_indexes| SELECT relid,
     indexrelid,
     schemaname,
diff --git a/src/test/subscription/t/035_retain_conflict_info.pl b/src/test/subscription/t/035_retain_conflict_info.pl
index 75539b2cba9..ec446191e95 100644
--- a/src/test/subscription/t/035_retain_conflict_info.pl
+++ b/src/test/subscription/t/035_retain_conflict_info.pl
@@ -1,7 +1,9 @@
 
 # Copyright (c) 2025, PostgreSQL Global Development Group
 
-# Test the management of the replication slot 'pg_conflict_detection'.
+# Test the CREATE SUBSCRIPTION 'retain_conflict_info' parameter and its
+# interaction with the management of the replication slot
+# 'pg_conflict_detection'.
 use strict;
 use warnings FATAL => 'all';
 use PostgreSQL::Test::Cluster;
@@ -15,7 +17,9 @@ my $subname_BA = 'tap_sub_b_a';
 # Setup a bidirectional logical replication between node_A & node_B
 ###############################################################################
 
-# Initialize nodes.
+# Initialize nodes. Enable the track_commit_timestamp on both nodes to detect
+# the conflict when attempting to update a row that was previously modified by
+# a different origin.
 
 # node_A. Increase the log_min_messages setting to DEBUG2 to debug test
 # failures. Disable autovacuum to avoid generating xid that could affect the
@@ -24,7 +28,8 @@ my $node_A = PostgreSQL::Test::Cluster->new('node_A');
 $node_A->init(allows_streaming => 'logical');
 $node_A->append_conf(
 	'postgresql.conf',
-	qq{autovacuum = off
+	qq{track_commit_timestamp = on
+	autovacuum = off
 	log_min_messages = 'debug2'});
 $node_A->start;
 
@@ -120,6 +125,13 @@ ok( $stderr =~
 	  qr/1 are dead but not yet removable/,
 	'the deleted column is non-removable');
 
+my $logfile = slurp_file($node_B->logfile(), $log_location);
+ok( $logfile =~
+	  qr/conflict detected on relation "public.tab": conflict=delete_origin_differs.*\n.*DETAIL:.* Deleting the row that was modified locally in transaction [0-9]+ at .*\n.*Existing local tuple \(1, 3\); replica identity \(a\)=\(1\)/,
+	'delete target row was modified in tab');
+
+$log_location = -s $node_A->logfile;
+
 # Remember the next transaction ID to be assigned
 my $next_xid = $node_A->safe_psql('postgres', "SELECT txid_current() + 1;");
 
@@ -127,6 +139,11 @@ $node_A->safe_psql(
 	'postgres', "ALTER SUBSCRIPTION $subname_AB ENABLE;");
 $node_B->wait_for_catchup($subname_AB);
 
+$logfile = slurp_file($node_A->logfile(), $log_location);
+ok( $logfile =~
+	  qr/conflict detected on relation "public.tab": conflict=update_deleted.*\n.*DETAIL:.* The row to be updated was deleted locally in transaction [0-9]+ at .*\n.*Remote tuple \(1, 3\); replica identity \(a\)=\(1\)/,
+	'update target row was deleted in tab');
+
 # Account for the transaction ID increment caused by enabling the subscription
 $next_xid++;
 
-- 
2.31.1