Minor improvements to SQL generation
-
x %in% y strips names of y (#269).
-
Enhancements for scoped verbs (mutate_all(), summarise_if(),
filter_at() etc) (#296, #306).
-
MS SQL use TOP 100 PERCENT as stop-gap to allow subqueries with
ORDER BY (#277).
-
Window functions now translated correctly for Hive (#293, @cderv).
