fix bug with distinct value counting
added callgrind output for sample query on postgres master
Merge branch 'piggyback_master' of https://github.com/mpws2013n1/postgres into piggyback_master
Print distinct values for col combination
added callgrind output for 25 bit hashset
fd computing
Add debug print for FD calculation
Merge branch 'piggyback_master' of https://github.com/mpws2013n1/postgres into piggyback_master

Conflicts:
	src/backend/piggyback/piggyback.c
Merge branch 'piggyback_master' of https://github.com/mpws2013n1/postgres.git into piggyback_master
debug prints
Fixed column combination distinct values count
Added FD calculation
Add char to supported value types
added callgrind output for select all customer on tpch - fd code base
added sending of fd's to client
Merge branch 'piggyback_master' of https://github.com/mpws2013n1/postgres into piggyback_master
use function slot_get_attr to get datum from tupletableslot, returns
isNull flag --> no null check on datum needed
check result->tts_isempty
Merge branch 'piggyback_master' of https://github.com/mpws2013n1/postgres into piggyback_master
added fd output to client
Merge branch 'piggyback_master' of https://github.com/mpws2013n1/postgres into piggyback_master