Speed up columnStoreMergeValues by storing valueId in variable for other mergeValue type
Check for end of delta iterator while merging.
Merge
More perf refressiosn
Implement additional benchmarks for sorted merging
Minor stylistic improvements
Extend performance regressions
Add performance regression for bkpf
Merge branch 'sortMergingPerformance' of github.com:Bensk1/hyrise into sortMergingPerformance
Minor correction