tree 374c8ac7296d108ee8fc47cfb836b848e89ae076
parent 6abc63e23029b9c5279a6a3be28f705b2a14bd7f
author Yingyi Bu <yingyi@couchbase.com> 1456338834 -0800
committer Yingyi Bu <buyingyi@gmail.com> 1456510576 -0800

ASTERIXDB-1322: fix variable visitors for SubplanOperator.

- Simplified the implementation of OperatorPropertiesUtil;
- Fixed PushProjectDownRule to not introduce project operator
  into a subplan to project outer variables.

Change-Id: I53ee1e27b41c9c80d51a7e1baf058d97338c18a9
Reviewed-on: https://asterix-gerrit.ics.uci.edu/662
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Till Westmann <tillw@apache.org>