Misc: vers_select_conds_t::init_from_sysvar()

sql/sql_select.cc

@@ -668,6 +668,29 @@ setup_without_group(THD *thd, Ref_ptr_array ref_pointer_array,
   DBUG_RETURN(res);
 }
 
+bool vers_select_conds_t::init_from_sysvar(THD *thd)
+{
+  const char var[]= "temporal_current_timestamp";
+  sys_var *sv= intern_find_sys_var(var, sizeof(var) - 1);
+  DBUG_ASSERT(sv);
+  const char *data= *(char **)sv->option.value;
+  DBUG_ASSERT(data);
+  if (0 == strcmp(data, "all"))
+  {
+    init(FOR_SYSTEM_TIME_ALL, UNIT_TIMESTAMP);
+  }
+  else if (0 != strcmp(data, "now"))
+  {
+    Item *ts=
+        create_temporal_literal(thd, data, strlen(data), system_charset_info,
+                                MYSQL_TYPE_DATETIME, true);
+    if (!ts)
+      return true;
+    init(FOR_SYSTEM_TIME_AS_OF, UNIT_TIMESTAMP, ts);
+  }
+  return false;
+}
+
 int vers_setup_select(THD *thd, TABLE_LIST *tables, COND **where_expr,
                       SELECT_LEX *slex)
 {
@@ -778,24 +801,8 @@ int vers_setup_select(THD *thd, TABLE_LIST *tables, COND **where_expr,
 
       if (vers_conditions.type == FOR_SYSTEM_TIME_UNSPECIFIED)
       {
-        const char var[]= "temporal_current_timestamp";
-        sys_var *sv= intern_find_sys_var(var, sizeof(var) - 1);
-        DBUG_ASSERT(sv);
-        const char *data= *(char **)sv->option.value;
-        DBUG_ASSERT(data);
-        if (0 == strcmp(data, "all"))
-        {
-          vers_conditions.init(FOR_SYSTEM_TIME_ALL, UNIT_TIMESTAMP);
-        }
-        else if (0 != strcmp(data, "now"))
-        {
-          Item *ts= create_temporal_literal(thd, data, strlen(data),
-                                            system_charset_info,
-                                            MYSQL_TYPE_DATETIME, true);
-          if (!ts)
-            DBUG_RETURN(-1);
-          vers_conditions.init(FOR_SYSTEM_TIME_AS_OF, UNIT_TIMESTAMP, ts);
-        }
+        if (vers_conditions.init_from_sysvar(thd))
+          DBUG_RETURN(-1);
       }
 
       if (vers_conditions.type != FOR_SYSTEM_TIME_UNSPECIFIED)

sql/table.h

@@ -1882,6 +1882,8 @@ struct vers_select_conds_t
     start= s;
     end= e;
   }
+
+  bool init_from_sysvar(THD *thd);
 };
 
 struct LEX;