fix LP 1347930 The main idea of the fix is as follows. 1. MC stats for compilation usage becomes multi-interval version, for key columns in a HBase table 2. MC stats stored in histogram cache now contains the multi-interval histogram.
Hybrid Query Cache feature implemented. The Hybrid Query Cache (HQC) is an enhancement of existing Query Cache, which is trying to find match queries in existing query cache at an earlier point, i.e. just after parser and before binder so as to avoid binder overhead if there's a hit. Two virutal table ISPs are added to show stats of Hybrid Query Cache. Add control of ISP to run locally or remotely. Changes after reviewers' comments. Fixup errors in SqlciErrors.txt that cause core/TEST014 failure. Fix minor issues about (hybrid)query cache ISP. Add HQC virtual table ISP tests to compGeneral/TEST042.