Invalid SQL syntax for NULLS LAST / NULLS FIRST in IgniteQueryGenerator

Ignite Spring Data's IgniteQueryGenerator (in all spring-data / spring-data-2.0 / spring-data-2.2 modules) generate invalid SQL when null handling other than native is used.

Currently generated query - invalid:

SELECT ... ORDER BY ... NULL FIRST ...

SELECT ... ORDER BY ... NULL LAST ...

Expected - valid:

SELECT ... ORDER BY ... NULL*S* FIRST ...

SELECT ... ORDER BY ... NULL*S* LAST ...