Fixes for supporting CTAS and native thread BF aborting

This patch will start a transaction in wsrep-lib, to enable rolling back
the victim

Author: sjaakola

mysql-test/suite/galera/r/galera_concurrent_ctas.result

@@ -1,3 +1,5 @@
+connection node_2;
+connection node_1;
 disconnect node_2;
 disconnect node_1;
 # End of test

sql/service_wsrep.cc

@@ -225,6 +225,12 @@ extern "C" my_bool wsrep_thd_bf_abort(const void* bf_thd_ptr,
 {
   const THD* bf_thd= (const THD*)bf_thd_ptr;
   THD* victim_thd= (THD*)victim_thd_ptr;
+
+  if (!victim_thd->wsrep_trx().active())
+  {
+    WSREP_DEBUG("BF abort for non active transaction");
+    wsrep_start_transaction(victim_thd, victim_thd->wsrep_next_trx_id());
+  }
   my_bool ret= wsrep_bf_abort(bf_thd, victim_thd);
   /*
     Send awake signal if victim was BF aborted or does not

sql/sql_insert.cc

@@ -4514,8 +4514,14 @@ select_create::binlog_show_create_table(TABLE **tables, uint count)
                               errcode);
   }
 #ifdef WITH_WSREP
-  // ha_wsrep_fake_trx_id(thd);
-  wsrep_start_transaction(thd, thd->wsrep_next_trx_id());
+  if (thd->wsrep_trx().active())
+  {
+    WSREP_DEBUG("transaction already started for CTAS");
+  }
+  else
+  {
+    wsrep_start_transaction(thd, thd->wsrep_next_trx_id());
+  }
 #endif
   return result;
 }

sql/wsrep_thd.cc

@@ -15,6 +15,7 @@
 
 #include "mariadb.h"
 #include "wsrep_thd.h"
+#include "wsrep_trans_observer.h"
 #include "wsrep_high_priority_service.h"
 #include "wsrep_storage_service.h"
 #include "transaction.h"
@@ -420,6 +421,13 @@ bool wsrep_bf_abort(const THD* bf_thd, THD* victim_thd)
   WSREP_LOG_THD((THD*)bf_thd, "BF aborter before");
   WSREP_LOG_THD(victim_thd, "victim before");
   wsrep::seqno bf_seqno(bf_thd->wsrep_trx().ws_meta().seqno());
+
+  if (!victim_thd->wsrep_trx().active())
+  {
+    WSREP_DEBUG("wsrep_bf_abort, BF abort for non active transaction");
+    wsrep_start_transaction(victim_thd, victim_thd->wsrep_next_trx_id());
+  }
+
   bool ret;
   if (wsrep_thd_is_toi(bf_thd))
   {