Import functions and types from Base.Sort for which methods will be added.

Author: dmbates

src/DataFrames.jl

@@ -36,8 +36,9 @@ const POOLED_DATA_VEC_REF_CONVERTER = uint16
 
 importall Base
 importall Stats
-import Base.Sort.Algorithm, Base.Sort.Ordering
-import Base.Sort.Perm, Base.Sort.Forward
+import Base.Sort.Algorithm, Base.Sort.By, Base.Sort.Forward
+import Base.Sort.Ordering, Base.Sort.Perm, Base.Sort.lt
+import Base.Sort.sort, Base.Sort.sort!, Base.Sort.sortby, Base.Sort.sortby!
 
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