Cleanups: DELETE HISTORY [MDEV-19814]

* Made make_versioned_*() proxies inline;
* Renamed truncate_history to delete_history

Part of:
MDEV-19814 Server crash in row_upd_del_mark_clust_rec or Assertion
`update->n_fields < ulint(table->n_cols + table->n_v_cols)' failed in
upd_node_t::make_versioned_helper

sql/sql_delete.cc

@@ -305,8 +305,8 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
 
   THD_STAGE_INFO(thd, stage_init_update);
 
-  bool truncate_history= table_list->vers_conditions.is_set();
-  if (truncate_history)
+  bool delete_history= table_list->vers_conditions.is_set();
+  if (delete_history)
   {
     if (table_list->is_view_or_derived())
     {
@@ -696,7 +696,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
     while (!(error=info.read_record()) && !thd->killed &&
           ! thd->is_error())
     {
-      if (record_should_be_deleted(thd, table, select, explain, truncate_history))
+      if (record_should_be_deleted(thd, table, select, explain, delete_history))
       {
         table->file->position(table->record[0]);
         if (unlikely((error=
@@ -727,10 +727,10 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
   {
     if (delete_while_scanning)
       delete_record= record_should_be_deleted(thd, table, select, explain,
-                                              truncate_history);
+                                              delete_history);
     if (delete_record)
     {
-      if (!truncate_history && table->triggers &&
+      if (!delete_history && table->triggers &&
           table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
                                             TRG_ACTION_BEFORE, FALSE))
       {
@@ -748,7 +748,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
       if (likely(!error))
       {
 	deleted++;
-        if (!truncate_history && table->triggers &&
+        if (!delete_history && table->triggers &&
             table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
                                               TRG_ACTION_AFTER, FALSE))
         {

storage/innobase/include/row0upd.h

@@ -589,14 +589,6 @@ struct upd_node_t{
 				/* column assignment list */
 	ulint		magic_n;
 
-	/** Also set row_start = CURRENT_TIMESTAMP/trx->id
-	@param[in]	trx	transaction */
-	void make_versioned_update(const trx_t* trx);
-	/** Only set row_end = CURRENT_TIMESTAMP/trx->id.
-	Do not touch other fields at all.
-	@param[in]	trx	transaction */
-	void make_versioned_delete(const trx_t* trx);
-
 private:
 	/** Appends row_start or row_end field to update vector and sets a
 	CURRENT_TIMESTAMP/trx->id value to it.
@@ -605,6 +597,24 @@ struct upd_node_t{
 	@param[in]	trx	transaction
 	@param[in]	vers_sys_idx	table->row_start or table->row_end */
 	void make_versioned_helper(const trx_t* trx, ulint idx);
+
+public:
+	/** Also set row_start = CURRENT_TIMESTAMP/trx->id
+	@param[in]	trx	transaction */
+	void make_versioned_update(const trx_t* trx)
+	{
+		make_versioned_helper(trx, table->vers_start);
+	}
+
+	/** Only set row_end = CURRENT_TIMESTAMP/trx->id.
+	Do not touch other fields at all.
+	@param[in]	trx	transaction */
+	void make_versioned_delete(const trx_t* trx)
+	{
+		update->n_fields = 0;
+		is_delete = VERSIONED_DELETE;
+		make_versioned_helper(trx, table->vers_end);
+	}
 };
 
 #define	UPD_NODE_MAGIC_N	1579975

storage/innobase/row/row0upd.cc

@@ -3485,7 +3485,8 @@ void upd_node_t::make_versioned_helper(const trx_t* trx, ulint idx)
 
 	dict_index_t* clust_index = dict_table_get_first_index(table);
 
-	/* row_create_update_node_for_mysql() pre-allocated this much */
+	/* row_create_update_node_for_mysql() pre-allocated this much.
+	   At least one PK column always remains unchanged. */
 	ut_ad(update->n_fields < ulint(table->n_cols + table->n_v_cols));
 
 	update->n_fields++;
@@ -3505,19 +3506,3 @@ void upd_node_t::make_versioned_helper(const trx_t* trx, ulint idx)
 	dfield_set_data(&ufield->new_val, update->vers_sys_value, col->len);
 }
 
-/** Also set row_start = CURRENT_TIMESTAMP/trx->id
-@param[in]	trx	transaction */
-void upd_node_t::make_versioned_update(const trx_t* trx)
-{
-	make_versioned_helper(trx, table->vers_start);
-}
-
-/** Only set row_end = CURRENT_TIMESTAMP/trx->id.
-Do not touch other fields at all.
-@param[in]	trx	transaction */
-void upd_node_t::make_versioned_delete(const trx_t* trx)
-{
-	update->n_fields = 0;
-	is_delete = VERSIONED_DELETE;
-	make_versioned_helper(trx, table->vers_end);
-}