tree bc94f091ce2f771a1843734b36a6585f0894f757
parent bf34d187dd0077b81c01126bbd4b83a15519a425
author Yingyi Bu <yingyi@couchbase.com> 1453954487 -0800
committer Yingyi Bu <buyingyi@gmail.com> 1453956129 -0800

ASTERIXDB-1005, ASTERIXDB-1263: Clean up subplan flattening:
1. Inline NestedTupleSource and remove SubplanOperator for special cases that
   join operators inside the SubplanOperator can be re-targeted for
   correlations;
2. Blindly inline NestedTupleSource and remove SubplanOperator for general cases
   where the condition of the special case is not met.

Change-Id: I4dd130a25f3c81272cc23f844ea20e376e990612
Reviewed-on: https://asterix-gerrit.ics.uci.edu/579
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Till Westmann <tillw@apache.org>