2 files changed, 43 insertions, 0 deletions

diff --git a/sql/ha_innodb.cc b/sql/ha_innodb.cc
index 0bca8c21715..9452723110f 100644
--- a/sql/ha_innodb.cc
+++ b/sql/ha_innodb.cc
@@ -4081,6 +4081,48 @@ ha_innobase::discard_or_import_tablespace(
 }
 
 /*********************************************************************
+Deletes all rows of an InnoDB table. */
+
+int
+ha_innobase::delete_all_rows(void)
+/*==============================*/
+				/* out: error number */
+{
+	row_prebuilt_t*	prebuilt	= (row_prebuilt_t*)innobase_prebuilt;
+	int		error;
+	trx_t*		trx;
+	THD*		thd		= current_thd;
+
+	DBUG_ENTER("ha_innobase::delete_all_rows");
+
+	if (thd->lex->sql_command != SQLCOM_TRUNCATE) {
+	fallback:
+		/* We only handle TRUNCATE TABLE t as a special case.
+		DELETE FROM t will have to use ha_innobase::delete_row(). */
+		DBUG_RETURN(my_errno=HA_ERR_WRONG_COMMAND);
+	}
+
+	/* Get the transaction associated with the current thd, or create one
+	if not yet created */
+
+	trx = check_trx_exists(thd);
+
+	/* Truncate the table in InnoDB */
+
+	error = row_truncate_table_for_mysql(prebuilt->table, trx);
+	if (error == DB_ERROR) {
+		/* Cannot truncate; resort to ha_innobase::delete_row() */
+		goto fallback;
+	}
+
+	innobase_commit_low(trx);
+
+	error = convert_error_code_to_mysql(error, NULL);
+
+	DBUG_RETURN(error);
+}
+
+/*********************************************************************
 Drops a table from an InnoDB database. Before calling this function,
 MySQL calls innobase_commit to commit the transaction of the current user.
 Then the current user cannot have locks set on the table. Drop table
diff --git a/sql/ha_innodb.h b/sql/ha_innodb.h
index fcb9165de64..437a33116d7 100644
--- a/sql/ha_innodb.h
+++ b/sql/ha_innodb.h
@@ -159,6 +159,7 @@ class ha_innobase: public handler
 
   	int create(const char *name, register TABLE *form,
 					HA_CREATE_INFO *create_info);
+	int delete_all_rows();
   	int delete_table(const char *name);
 	int rename_table(const char* from, const char* to);
 	int check(THD* thd, HA_CHECK_OPT* check_opt);