Let table AM insertion methods control index insertion

Previously, the executor did index insert unconditionally after calling
table AM interface methods tuple_insert() and multi_insert().  This commit
introduces the new parameter insert_indexes for these two methods.  Setting
'*insert_indexes' to true saves the current logic.  Setting it to false
indicates that table AM cares about index inserts itself and doesn't want the
caller to do that.

Discussion: https://postgr.es/m/CAPpHfdurb9ycV8udYqM%3Do0sPS66PJ4RCBM1g-bBpvzUfogY0EA%40mail.gmail.com
Reviewed-by: Pavel Borisov, Matthias van de Meent, Mark Dilger

src/backend/access/heap/heapam.c

@@ -2088,7 +2088,8 @@ heap_multi_insert_pages(HeapTuple *heaptuples, int done, int ntuples, Size saveF
  */
 void
 heap_multi_insert(Relation relation, TupleTableSlot **slots, int ntuples,
-				  CommandId cid, int options, BulkInsertState bistate)
+				  CommandId cid, int options, BulkInsertState bistate,
+				  bool *insert_indexes)
 {
 	TransactionId xid = GetCurrentTransactionId();
 	HeapTuple  *heaptuples;
@@ -2437,6 +2438,7 @@ heap_multi_insert(Relation relation, TupleTableSlot **slots, int ntuples,
 		slots[i]->tts_tid = heaptuples[i]->t_self;
 
 	pgstat_count_heap_insert(relation, ntuples);
+	*insert_indexes = true;
 }
 
 /*

src/backend/access/heap/heapam_handler.c

@@ -245,7 +245,7 @@ heapam_tuple_satisfies_snapshot(Relation rel, TupleTableSlot *slot,
 
 static TupleTableSlot *
 heapam_tuple_insert(Relation relation, TupleTableSlot *slot, CommandId cid,
-					int options, BulkInsertState bistate)
+					int options, BulkInsertState bistate, bool *insert_indexes)
 {
 	bool		shouldFree = true;
 	HeapTuple	tuple = ExecFetchSlotHeapTuple(slot, true, &shouldFree);
@@ -261,6 +261,8 @@ heapam_tuple_insert(Relation relation, TupleTableSlot *slot, CommandId cid,
 	if (shouldFree)
 		pfree(tuple);
 
+	*insert_indexes = true;
+
 	return slot;
 }
 

src/backend/access/table/tableam.c

@@ -273,9 +273,11 @@ table_tuple_get_latest_tid(TableScanDesc scan, ItemPointer tid)
  * default command ID and not allowing access to the speedup options.
  */
 void
-simple_table_tuple_insert(Relation rel, TupleTableSlot *slot)
+simple_table_tuple_insert(Relation rel, TupleTableSlot *slot,
+						  bool *insert_indexes)
 {
-	table_tuple_insert(rel, slot, GetCurrentCommandId(true), 0, NULL);
+	table_tuple_insert(rel, slot, GetCurrentCommandId(true), 0, NULL,
+					   insert_indexes);
 }
 
 /*

src/backend/catalog/indexing.c

@@ -273,12 +273,14 @@ void
 CatalogTuplesMultiInsertWithInfo(Relation heapRel, TupleTableSlot **slot,
 								 int ntuples, CatalogIndexState indstate)
 {
+	bool		insertIndexes;
+
 	/* Nothing to do */
 	if (ntuples <= 0)
 		return;
 
 	heap_multi_insert(heapRel, slot, ntuples,
-					  GetCurrentCommandId(true), 0, NULL);
+					  GetCurrentCommandId(true), 0, NULL, &insertIndexes);
 
 	/*
 	 * There is no equivalent to heap_multi_insert for the catalog indexes, so

src/backend/commands/copyfrom.c

@@ -397,6 +397,7 @@ CopyMultiInsertBufferFlush(CopyMultiInsertInfo *miinfo,
 		bool		line_buf_valid = cstate->line_buf_valid;
 		uint64		save_cur_lineno = cstate->cur_lineno;
 		MemoryContext oldcontext;
+		bool		insertIndexes;
 
 		Assert(buffer->bistate != NULL);
 
@@ -416,7 +417,8 @@ CopyMultiInsertBufferFlush(CopyMultiInsertInfo *miinfo,
 						   nused,
 						   mycid,
 						   ti_options,
-						   buffer->bistate);
+						   buffer->bistate,
+						   &insertIndexes);
 		MemoryContextSwitchTo(oldcontext);
 
 		for (i = 0; i < nused; i++)
@@ -425,7 +427,7 @@ CopyMultiInsertBufferFlush(CopyMultiInsertInfo *miinfo,
 			 * If there are any indexes, update them for all the inserted
 			 * tuples, and run AFTER ROW INSERT triggers.
 			 */
-			if (resultRelInfo->ri_NumIndices > 0)
+			if (insertIndexes && resultRelInfo->ri_NumIndices > 0)
 			{
 				List	   *recheckIndexes;
 
@@ -1265,11 +1267,14 @@ CopyFrom(CopyFromState cstate)
 					}
 					else
 					{
+						bool		insertIndexes;
+
 						/* OK, store the tuple and create index entries for it */
 						table_tuple_insert(resultRelInfo->ri_RelationDesc,
-										   myslot, mycid, ti_options, bistate);
+										   myslot, mycid, ti_options, bistate,
+										   &insertIndexes);
 
-						if (resultRelInfo->ri_NumIndices > 0)
+						if (insertIndexes && resultRelInfo->ri_NumIndices > 0)
 							recheckIndexes = ExecInsertIndexTuples(resultRelInfo,
 																   myslot,
 																   estate,

src/backend/commands/createas.c

@@ -578,6 +578,7 @@ static bool
 intorel_receive(TupleTableSlot *slot, DestReceiver *self)
 {
 	DR_intorel *myState = (DR_intorel *) self;
+	bool		insertIndexes;
 
 	/* Nothing to insert if WITH NO DATA is specified. */
 	if (!myState->into->skipData)
@@ -594,7 +595,8 @@ intorel_receive(TupleTableSlot *slot, DestReceiver *self)
 						   slot,
 						   myState->output_cid,
 						   myState->ti_options,
-						   myState->bistate);
+						   myState->bistate,
+						   &insertIndexes);
 	}
 
 	/* We know this is a newly created relation, so there are no indexes */

src/backend/commands/matview.c

@@ -476,6 +476,7 @@ static bool
 transientrel_receive(TupleTableSlot *slot, DestReceiver *self)
 {
 	DR_transientrel *myState = (DR_transientrel *) self;
+	bool		insertIndexes;
 
 	/*
 	 * Note that the input slot might not be of the type of the target
@@ -490,7 +491,8 @@ transientrel_receive(TupleTableSlot *slot, DestReceiver *self)
 					   slot,
 					   myState->output_cid,
 					   myState->ti_options,
-					   myState->bistate);
+					   myState->bistate,
+					   &insertIndexes);
 
 	/* We know this is a newly created relation, so there are no indexes */
 

src/backend/commands/tablecmds.c

@@ -6360,8 +6360,12 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap, LOCKMODE lockmode)
 
 			/* Write the tuple out to the new relation */
 			if (newrel)
+			{
+				bool		insertIndexes;
+
 				table_tuple_insert(newrel, insertslot, mycid,
-								   ti_options, bistate);
+								   ti_options, bistate, &insertIndexes);
+			}
 
 			ResetExprContext(econtext);
 

src/backend/executor/execReplication.c

@@ -509,6 +509,7 @@ ExecSimpleRelationInsert(ResultRelInfo *resultRelInfo,
 	if (!skip_tuple)
 	{
 		List	   *recheckIndexes = NIL;
+		bool		insertIndexes;
 
 		/* Compute stored generated columns */
 		if (rel->rd_att->constr &&
@@ -523,9 +524,10 @@ ExecSimpleRelationInsert(ResultRelInfo *resultRelInfo,
 			ExecPartitionCheck(resultRelInfo, slot, estate, true);
 
 		/* OK, store the tuple and create index entries for it */
-		simple_table_tuple_insert(resultRelInfo->ri_RelationDesc, slot);
+		simple_table_tuple_insert(resultRelInfo->ri_RelationDesc, slot,
+								  &insertIndexes);
 
-		if (resultRelInfo->ri_NumIndices > 0)
+		if (insertIndexes && resultRelInfo->ri_NumIndices > 0)
 			recheckIndexes = ExecInsertIndexTuples(resultRelInfo,
 												   slot, estate, false, false,
 												   NULL, NIL, false);

src/backend/executor/nodeModifyTable.c

@@ -1135,13 +1135,15 @@ ExecInsert(ModifyTableContext *context,
 		}
 		else
 		{
+			bool		insertIndexes;
+
 			/* insert the tuple normally */
 			slot = table_tuple_insert(resultRelationDesc, slot,
 									  estate->es_output_cid,
-									  0, NULL);
+									  0, NULL, &insertIndexes);
 
 			/* insert index entries for tuple */
-			if (resultRelInfo->ri_NumIndices > 0)
+			if (insertIndexes && resultRelInfo->ri_NumIndices > 0)
 				recheckIndexes = ExecInsertIndexTuples(resultRelInfo,
 													   slot, estate, false,
 													   false, NULL, NIL,