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diff --git a/sql/wsrep_applier.h b/sql/wsrep_applier.h
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+/* Copyright 2013-2019 Codership Oy <http://www.codership.com>
+
+   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
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+#ifndef WSREP_APPLIER_H
+#define WSREP_APPLIER_H
+
+#include "sql_class.h" // THD class
+#include "rpl_rli.h"   // Relay_log_info
+#include "log_event.h" // Format_description_log_event
+
+int wsrep_apply_events(THD*        thd,
+                       Relay_log_info* rli,
+                       const void* events_buf,
+                       size_t      buf_len);
+
+/* Applier error codes, when nothing better is available. */
+#define WSREP_RET_SUCCESS      0 // Success
+#define WSREP_ERR_GENERIC      1 // When in doubt (MySQL default error code)
+#define WSREP_ERR_BAD_EVENT    2 // Can't parse event
+#define WSREP_ERR_NOT_FOUND    3 // Key. table, schema not found
+#define WSREP_ERR_EXISTS       4 // Key, table, schema already exists
+#define WSREP_ERR_WRONG_TYPE   5 // Incompatible data type
+#define WSREP_ERR_FAILED       6 // Operation failed for some internal reason
+#define WSREP_ERR_ABORTED      7 // Operation was aborted externally
+
+void wsrep_store_error(const THD* thd, wsrep::mutable_buffer& buf);
+
+class Format_description_log_event;
+void wsrep_set_apply_format(THD*, Format_description_log_event*);
+Format_description_log_event* wsrep_get_apply_format(THD* thd);
+
+#endif /* WSREP_APPLIER_H */