Distributed TPCH incorrect results and sub-optimal plan

[arzuschen]

currently with redistribution and gather directly added from logic tree:
q01, q02, q03, q04, q05, q06, q10, q11, q12, q14, a16, q17, q18, q19, q20, q21 are runnable
q01, q03, q04, q06, q10, q12, q14 have output

q10 has incorrect result due to NLJoin with distributed data stream
q04 has incorrect output, wrong tuple and most part missing

[arzuschen]

#194 q10 incorrect result fixed.

[arzuschen]

q04 has unstable output, q18 and q20 have unstable plan (similar to Q16, extra "loop")

[9DemonFox]

#263 , they might have the same cause. The FROM clause in TPCH is not handled correctly. I am working to check it.