Remove unused HA_EXTRA_FAKE_START_STMT

This is fixup for commit f06a0b5.

Author: dr-m

include/my_base.h

@@ -1,5 +1,5 @@
 /* Copyright (c) 2000, 2012, Oracle and/or its affiliates.
- Copyright (c) 1995, 2018, MariaDB Corporation.
+ Copyright (c) 1995, 2021, MariaDB Corporation.
 
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
@@ -213,9 +213,7 @@ enum ha_extra_function {
  /** Start writing rows during ALTER TABLE...ALGORITHM=COPY. */
  HA_EXTRA_BEGIN_ALTER_COPY,
  /** Finish writing rows during ALTER TABLE...ALGORITHM=COPY. */
- HA_EXTRA_END_ALTER_COPY,
- /** Fake the start of a statement after wsrep_load_data_splitting hack */
- HA_EXTRA_FAKE_START_STMT
+ HA_EXTRA_END_ALTER_COPY
 };
 
 /* Compatible option, to be deleted in 6.0 */

sql/ha_partition.cc

@@ -1,6 +1,6 @@
 /*
  Copyright (c) 2005, 2019, Oracle and/or its affiliates.
- Copyright (c) 2009, 2020, MariaDB
+ Copyright (c) 2009, 2021, MariaDB
 
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
@@ -9060,7 +9060,6 @@ int ha_partition::extra(enum ha_extra_function operation)
  case HA_EXTRA_STARTING_ORDERED_INDEX_SCAN:
  case HA_EXTRA_BEGIN_ALTER_COPY:
  case HA_EXTRA_END_ALTER_COPY:
- case HA_EXTRA_FAKE_START_STMT:
  DBUG_RETURN(loop_partitions(extra_cb, &operation));
  default:
  {

storage/innobase/handler/ha_innodb.cc

@@ -15318,10 +15318,6 @@ ha_innobase::extra(
 case HA_EXTRA_END_ALTER_COPY:
 m_prebuilt->table->skip_alter_undo = 0;
 break;
-case HA_EXTRA_FAKE_START_STMT:
-trx_register_for_2pc(m_prebuilt->trx);
-m_prebuilt->sql_stat_start = true;
-break;
 default:/* Do nothing */
 ;
 }

storage/mroonga/ha_mroonga.cpp

@@ -550,9 +550,6 @@ static const char *mrn_inspect_extra_function(enum ha_extra_function operation)
  case HA_EXTRA_END_ALTER_COPY:
  inspected = "HA_EXTRA_END_ALTER_COPY";
  break;
- case HA_EXTRA_FAKE_START_STMT:
- inspected = "HA_EXTRA_FAKE_START_STMT";
- break;
 #ifdef MRN_HAVE_HA_EXTRA_EXPORT
  case HA_EXTRA_EXPORT:
  inspected = "HA_EXTRA_EXPORT";