From 32e42531f79b36481de0d5d7d46a9ff49fbdca28 Mon Sep 17 00:00:00 2001
From: jian he <jian.universality@gmail.com>
Date: Sun, 10 May 2026 11:54:30 +0800
Subject: [PATCH v14 1/2] export ExecInsert

The ExecInsert function encapsulates core logic for the insertion pipeline,
including partition routing, BEFORE ROW triggers, INSTEAD OF triggers, and AFTER
ROW triggers and others.

reference: https://postgr.es/m/CACJufxHi53OpGYPAe6SdCb4m=-+H8L+7LDbUWvTiJp=V4YYEqA@mail.gmail.com
reference: https://postgr.es/m/752672.1699474336%40sss.pgh.pa.us
discussion: https://postgr.es/m/CACJufxH_OJpVra=0c4ow8fbxHj7heMcVaTNEPa5vAurSeNA-6Q@mail.gmail.com
commitfest entry: https://commitfest.postgresql.org/patch/4817
---
 src/backend/executor/nodeModifyTable.c | 40 +----------------------
 src/include/executor/nodeModifyTable.h | 45 ++++++++++++++++++++++++++
 2 files changed, 46 insertions(+), 39 deletions(-)

diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index b9781eb3b95..518c3d07b13 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -84,44 +84,6 @@ typedef struct MTTargetRelLookup
 	int			relationIndex;	/* rel's index in resultRelInfo[] array */
 } MTTargetRelLookup;
 
-/*
- * Context struct for a ModifyTable operation, containing basic execution
- * state and some output variables populated by ExecUpdateAct() and
- * ExecDeleteAct() to report the result of their actions to callers.
- */
-typedef struct ModifyTableContext
-{
-	/* Operation state */
-	ModifyTableState *mtstate;
-	EPQState   *epqstate;
-	EState	   *estate;
-
-	/*
-	 * Slot containing tuple obtained from ModifyTable's subplan.  Used to
-	 * access "junk" columns that are not going to be stored.
-	 */
-	TupleTableSlot *planSlot;
-
-	/*
-	 * Information about the changes that were made concurrently to a tuple
-	 * being updated or deleted
-	 */
-	TM_FailureData tmfd;
-
-	/*
-	 * The tuple deleted when doing a cross-partition UPDATE with a RETURNING
-	 * clause that refers to OLD columns (converted to the root's tuple
-	 * descriptor).
-	 */
-	TupleTableSlot *cpDeletedSlot;
-
-	/*
-	 * The tuple projected by the INSERT's RETURNING clause, when doing a
-	 * cross-partition UPDATE
-	 */
-	TupleTableSlot *cpUpdateReturningSlot;
-} ModifyTableContext;
-
 /*
  * Context struct containing output data specific to UPDATE operations.
  */
@@ -870,7 +832,7 @@ ExecGetUpdateNewTuple(ResultRelInfo *relinfo,
  *		save the previous value to avoid losing track of it.
  * ----------------------------------------------------------------
  */
-static TupleTableSlot *
+TupleTableSlot *
 ExecInsert(ModifyTableContext *context,
 		   ResultRelInfo *resultRelInfo,
 		   TupleTableSlot *slot,
diff --git a/src/include/executor/nodeModifyTable.h b/src/include/executor/nodeModifyTable.h
index f6070e1cdf3..250bd64ad15 100644
--- a/src/include/executor/nodeModifyTable.h
+++ b/src/include/executor/nodeModifyTable.h
@@ -13,8 +13,47 @@
 #ifndef NODEMODIFYTABLE_H
 #define NODEMODIFYTABLE_H
 
+#include "access/tableam.h"
 #include "nodes/execnodes.h"
 
+/*
+ * Context struct for a ModifyTable operation, containing basic execution
+ * state and some output variables populated by ExecUpdateAct() and
+ * ExecDeleteAct() to report the result of their actions to callers.
+ */
+typedef struct ModifyTableContext
+{
+	/* Operation state */
+	ModifyTableState *mtstate;
+	EPQState   *epqstate;
+	EState	   *estate;
+
+	/*
+	 * Slot containing tuple obtained from ModifyTable's subplan.  Used to
+	 * access "junk" columns that are not going to be stored.
+	 */
+	TupleTableSlot *planSlot;
+
+	/*
+	 * Information about the changes that were made concurrently to a tuple
+	 * being updated or deleted
+	 */
+	TM_FailureData tmfd;
+
+	/*
+	 * The tuple deleted when doing a cross-partition UPDATE with a RETURNING
+	 * clause that refers to OLD columns (converted to the root's tuple
+	 * descriptor).
+	 */
+	TupleTableSlot *cpDeletedSlot;
+
+	/*
+	 * The tuple projected by the INSERT's RETURNING clause, when doing a
+	 * cross-partition UPDATE
+	 */
+	TupleTableSlot *cpUpdateReturningSlot;
+} ModifyTableContext;
+
 extern void ExecInitGenerated(ResultRelInfo *resultRelInfo,
 							  EState *estate,
 							  CmdType cmdtype);
@@ -24,6 +63,12 @@ extern void ExecComputeStoredGenerated(ResultRelInfo *resultRelInfo,
 									   CmdType cmdtype);
 
 extern ModifyTableState *ExecInitModifyTable(ModifyTable *node, EState *estate, int eflags);
+extern TupleTableSlot *ExecInsert(ModifyTableContext *context,
+								  ResultRelInfo *resultRelInfo,
+								  TupleTableSlot *slot,
+								  bool canSetTag,
+								  TupleTableSlot **inserted_tuple,
+								  ResultRelInfo **insert_destrel);
 extern void ExecEndModifyTable(ModifyTableState *node);
 extern void ExecReScanModifyTable(ModifyTableState *node);
 
-- 
2.34.1