1 files changed, 71 insertions, 0 deletions
diff --git a/sql/sql_truncate.h b/sql/sql_truncate.h
new file mode 100644
index 00000000..5704da1d
--- /dev/null
+++ b/sql/sql_truncate.h
@@ -0,0 +1,71 @@
+#ifndef SQL_TRUNCATE_INCLUDED
+#define SQL_TRUNCATE_INCLUDED
+/* Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
+
+   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 St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+class THD;
+struct TABLE_LIST;
+
+/**
+  Sql_cmd_truncate_table represents the TRUNCATE statement.
+*/
+class Sql_cmd_truncate_table : public Sql_cmd
+{
+private:
+  /* Set if a lock must be downgraded after truncate is done. */
+  MDL_ticket *m_ticket_downgrade;
+
+public:
+  /**
+    Constructor, used to represent a TRUNCATE statement.
+  */
+  Sql_cmd_truncate_table() = default;
+
+  virtual ~Sql_cmd_truncate_table() = default;
+
+  /**
+    Execute a TRUNCATE statement at runtime.
+    @param thd the current thread.
+    @return false on success.
+  */
+  bool execute(THD *thd);
+
+  virtual enum_sql_command sql_command_code() const
+  {
+    return SQLCOM_TRUNCATE;
+  }
+
+protected:
+  enum truncate_result{
+    TRUNCATE_OK=0,
+    TRUNCATE_FAILED_BUT_BINLOG,
+    TRUNCATE_FAILED_SKIP_BINLOG
+  };
+
+  /** Handle locking a base table for truncate. */
+  bool lock_table(THD *, TABLE_LIST *, bool *);
+
+  /** Truncate table via the handler method. */
+  enum truncate_result handler_truncate(THD *, TABLE_LIST *, bool);
+
+  /**
+    Optimized delete of all rows by doing a full regenerate of the table.
+    Depending on the storage engine, it can be accomplished through a
+    drop and recreate or via the handler truncate method.
+  */
+  bool truncate_table(THD *, TABLE_LIST *);
+};
+
+#endif