Fix gcc-12 -O2 -Warray-bounds

sql/handler.h

@@ -2,7 +2,7 @@
 #define HANDLER_INCLUDED
 /*
    Copyright (c) 2000, 2019, Oracle and/or its affiliates.
-   Copyright (c) 2009, 2021, MariaDB
+   Copyright (c) 2009, 2022, MariaDB
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
@@ -4275,7 +4275,7 @@ static inline const char *ha_resolve_storage_engine_name(const handlerton *db_ty
 
 static inline bool ha_check_storage_engine_flag(const handlerton *db_type, uint32 flag)
 {
-  return db_type == NULL ? FALSE : MY_TEST(db_type->flags & flag);
+  return db_type && (db_type->flags & flag);
 }
 
 static inline bool ha_storage_engine_is_enabled(const handlerton *db_type)

sql/sql_table.cc

@@ -9191,22 +9191,24 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
     create_info->used_fields |= HA_CREATE_USED_ROW_FORMAT;
   }
 
+  handlerton * const old_db_type= table->s->db_type();
+  handlerton *new_db_type= create_info->db_type;
+
   DBUG_PRINT("info", ("old type: %s  new type: %s",
-             ha_resolve_storage_engine_name(table->s->db_type()),
-             ha_resolve_storage_engine_name(create_info->db_type)));
-  if (ha_check_storage_engine_flag(table->s->db_type(), HTON_ALTER_NOT_SUPPORTED))
+             ha_resolve_storage_engine_name(old_db_type),
+             ha_resolve_storage_engine_name(new_db_type)));
+  if (ha_check_storage_engine_flag(old_db_type, HTON_ALTER_NOT_SUPPORTED))
   {
     DBUG_PRINT("info", ("doesn't support alter"));
-    my_error(ER_ILLEGAL_HA, MYF(0), hton_name(table->s->db_type())->str,
+    my_error(ER_ILLEGAL_HA, MYF(0), hton_name(old_db_type)->str,
              alter_ctx.db, alter_ctx.table_name);
     DBUG_RETURN(true);
   }
 
-  if (ha_check_storage_engine_flag(create_info->db_type,
-                                   HTON_ALTER_NOT_SUPPORTED))
+  if (ha_check_storage_engine_flag(new_db_type, HTON_ALTER_NOT_SUPPORTED))
   {
     DBUG_PRINT("info", ("doesn't support alter"));
-    my_error(ER_ILLEGAL_HA, MYF(0), hton_name(create_info->db_type)->str,
+    my_error(ER_ILLEGAL_HA, MYF(0), hton_name(new_db_type)->str,
              alter_ctx.new_db, alter_ctx.new_name);
     DBUG_RETURN(true);
   }
@@ -9349,6 +9351,17 @@ do_continue:;
       DBUG_RETURN(true);
     }
   }
+  /*
+    If the old table had partitions and we are doing ALTER TABLE ...
+    engine= <new_engine>, the new table must preserve the original
+    partitioning. This means that the new engine is still the
+    partitioning engine, not the engine specified in the parser.
+    This is discovered in prep_alter_part_table, which in such case
+    updates create_info->db_type.
+    It's therefore important that the assignment below is done
+    after prep_alter_part_table.
+  */
+  new_db_type= create_info->db_type;
 #endif
 
   if (mysql_prepare_alter_table(thd, table, create_info, alter_info,
@@ -9424,7 +9437,7 @@ do_continue:;
        Alter_info::ALTER_TABLE_ALGORITHM_INPLACE)
       || is_inplace_alter_impossible(table, create_info, alter_info)
       || IF_PARTITIONING((partition_changed &&
-          !(table->s->db_type()->partition_flags() & HA_USE_AUTO_PARTITION)), 0))
+          !(old_db_type->partition_flags() & HA_USE_AUTO_PARTITION)), 0))
   {
     if (alter_info->requested_algorithm ==
         Alter_info::ALTER_TABLE_ALGORITHM_INPLACE)
@@ -9441,22 +9454,10 @@ do_continue:;
     request table rebuild. Set ALTER_RECREATE flag to force table
     rebuild.
   */
-  if (create_info->db_type == table->s->db_type() &&
+  if (new_db_type == old_db_type &&
       create_info->used_fields & HA_CREATE_USED_ENGINE)
     alter_info->flags|= Alter_info::ALTER_RECREATE;
 
-  /*
-    If the old table had partitions and we are doing ALTER TABLE ...
-    engine= <new_engine>, the new table must preserve the original
-    partitioning. This means that the new engine is still the
-    partitioning engine, not the engine specified in the parser.
-    This is discovered in prep_alter_part_table, which in such case
-    updates create_info->db_type.
-    It's therefore important that the assignment below is done
-    after prep_alter_part_table.
-  */
-  handlerton *new_db_type= create_info->db_type;
-  handlerton *old_db_type= table->s->db_type();
   TABLE *new_table= NULL;
   ha_rows copied=0,deleted=0;
 

storage/innobase/fts/fts0fts.cc

@@ -2313,9 +2313,7 @@ fts_trx_table_create(
 	fts_trx_table_t*	ftt;
 
 	ftt = static_cast<fts_trx_table_t*>(
-		mem_heap_alloc(fts_trx->heap, sizeof(*ftt)));
-
-	memset(ftt, 0x0, sizeof(*ftt));
+		mem_heap_zalloc(fts_trx->heap, sizeof *ftt));
 
 	ftt->table = table;
 	ftt->fts_trx = fts_trx;