covering array index latency increase after 2 query commits

Looks like there are two commits which are causing higher latency across all percentiles for this test: 90th percentile query latency (ms), Q2 Array Indexing, Covering, Singleton Unique Lookup, 450 queries/sec

http://showfast.sc.couchbase.com/#/timeline/Linux/n1ql/array/all

4735 - http://perf.jenkins.couchbase.com/job/iris/24899/ - 6.3
4745 - http://perf.jenkins.couchbase.com/job/iris/25031/ - 10.6
4750 - http://perf.jenkins.couchbase.com/job/iris/25033/ - 6.9
4753 - http://perf.jenkins.couchbase.com/job/iris/25034/ - 8.0 <--
4754 - http://perf.jenkins.couchbase.com/job/iris/25036/ - 6.8 <--
4755 - http://perf.jenkins.couchbase.com/job/iris/25032/ - 311 <--
4765 - http://perf.jenkins.couchbase.com/job/iris/25025/ - 322
4797 - http://perf.jenkins.couchbase.com/job/iris/24992/ - 309

There are two commits, one in 4574 and the other in 4575. The first commit causes queries to begin to timeout (4 minutes) but no overall increase in latency. The second commit further causes increase in latency.

http://changelog.build.couchbase.com/?product=couchbase-server&fromVersion=7.0.0&fromBuild=4753&toVersion=7.0.0&toBuild=4755&f_query=on&f_query-ee=on

http://cbmonitor.sc.couchbase.com/reports/html/?snapshot=iris_700-4753_access_07ed&snapshot=iris_700-4755_access_2799