PHOENIX-1434 Stats are not maintained correctly through splits (Mujtaba)
PHOENIX-1432 Run limit query that has only leading PK column filter serially
PHOENIX-1429 Cancel queued threads when limit reached
PHOENIX-1427 Reduce work in StatsCollector
PHOENIX-1446 Add/fix logging for LIMIT optimization
PHOENIX-1447 Increase guidepost width default to take into account FAST_DIFF compression