add a separate function fixDistributedUserDefinedAggregate instead of writing the code in fixDistributedApproxCountDistinct
add a separate function fixDistributedUserDefinedAggregate instead of writing the code in fixDistributedApproxCountDistinct

VoltDB/voltdb,VoltDB/voltdb,VoltDB/voltdb,VoltDB/voltdb,VoltDB/voltdb,VoltDB/voltdb,VoltDB/voltdb