tree bd42baaca341796d92b556befbf3a832476ee3a1
parent 67df1b12fac5abf2c715578bf594afed4795e59a
author Yingyi Bu <yingyi@couchbase.com> 1453951357 -0800
committer Yingyi Bu <buyingyi@gmail.com> 1453956093 -0800

ASTERIXDB-1005, ASTERIXDB-1263: clean up subplan flattening, including:
1. Fixed the data property progation in HashJoin, NestedLoopJoin, PreClusteredGroupBy, and BroadcastExchange;
2. Fixed race conditions in SplitOperatorDescriptor;
3. Added a top-down pass for JobBuilder to set location constraints;
4. Fixed AbstractIntroduceGroupByCombinerRule for general cases.

Change-Id: I0197dc879cf983577e63ea5c047144966c0f7a3c
Reviewed-on: https://asterix-gerrit.ics.uci.edu/572
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Till Westmann <tillw@apache.org>