From a3f56e8f5877bb4c8a636c13cdf9f6cc1baecdfb Mon Sep 17 00:00:00 2001
From: Andres Freund <andres@anarazel.de>
Date: Tue, 4 Dec 2018 11:11:09 -0800
Subject: [PATCH] WIP: ForceStore HeapTupleDatum

Author:
Reviewed-By:
Discussion: https://postgr.es/m/
Backpatch:
---
 src/backend/executor/execTuples.c | 23 +++++++++++++++++++++++
 src/include/executor/tuptable.h   |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/src/backend/executor/execTuples.c b/src/backend/executor/execTuples.c
index ac5d76bd41..472a5f39cf 100644
--- a/src/backend/executor/execTuples.c
+++ b/src/backend/executor/execTuples.c
@@ -1459,6 +1459,29 @@ ExecForceStoreMinimalTuple(MinimalTuple mtup,
 	}
 }
 
+void
+ExecForceStoreHeapTupleDatum(Datum data, TupleTableSlot *slot)
+{
+	HeapTuple	tuple;
+	HeapTupleHeader td;
+
+	td = DatumGetHeapTupleHeader(data);
+
+	tuple = (HeapTuple) palloc(HEAPTUPLESIZE + HeapTupleHeaderGetDatumLength(td));
+	tuple->t_len = HeapTupleHeaderGetDatumLength(td);
+	tuple->t_self = td->t_ctid;
+	tuple->t_data = (HeapTupleHeader) ((char *) tuple + HEAPTUPLESIZE);
+	memcpy((char *) tuple->t_data, (char *) td, tuple->t_len);
+
+	ExecClearTuple(slot);
+
+	heap_deform_tuple(tuple, slot->tts_tupleDescriptor,
+					  slot->tts_values, slot->tts_isnull);
+	ExecStoreVirtualTuple(slot);
+
+	ExecMaterializeSlot(slot);
+}
+
 /* --------------------------------
  *		ExecStoreVirtualTuple
  *			Mark a slot as containing a virtual tuple.
diff --git a/src/include/executor/tuptable.h b/src/include/executor/tuptable.h
index db5031f574..5c390a9669 100644
--- a/src/include/executor/tuptable.h
+++ b/src/include/executor/tuptable.h
@@ -302,6 +302,8 @@ extern TupleTableSlot *ExecStoreHeapTuple(HeapTuple tuple,
 				   TupleTableSlot *slot,
 				   bool shouldFree);
 extern void ExecForceStoreHeapTuple(HeapTuple tuple, TupleTableSlot *slot);
+/* FIXME: Remove */
+extern void ExecForceStoreHeapTupleDatum(Datum data, TupleTableSlot *slot);
 extern TupleTableSlot *ExecStoreBufferHeapTuple(HeapTuple tuple,
 						 TupleTableSlot *slot,
 						 Buffer buffer);
-- 
2.39.5