Last_value() Windowing function returned an syntax error

InfiniDB> getcalpontsoft
getcalpontsoftwareinfo Mon May 23 09:32:32 2016

Name : infinidb-platform Relocations: (not relocatable)
Version : 5.0 Vendor: MariaDB, Inc.
Release : 0 Build Date: Sun 15 May 2016 07:24:29 PM CDT
Install Date: Mon 16 May 2016 05:21:51 PM CDT Build Host: srvbuilder

The Last_value() function was working in earlier build of ColumnStore, although the returned result was incorrect(There is an bug opened for this incorrect result issue). Now this function returns a syntax error in the build.

MariaDB [tpch1m]> select o_custkey, Last_value(o_orderkey) OVER (PARTITION BY abs(o_custkey)+10 ORDER BY o_custkey DESC NULLS LAST ,o_orderkey DESC NULLS LAST ,o_orderdate DESC NULLS LAST ROWS BETWEEN 15 FOLLOWING AND 15 FOLLOWING) from (select * from orders where o_custkey <= 20000) s;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'OVER (PARTITION BY abs(o_custkey)+10 ORDER BY o_custkey DESC NULLS LAST ,o_order' at line 1