simplify tables code (#54)

Author: piever

src/tables.jl

@@ -6,9 +6,4 @@ Tables.columnaccess(::Type{<:StructVector}) = true
 Tables.rows(s::StructVector) = s
 Tables.columns(s::StructVector) = fieldarrays(s)
 
-function Tables.schema(s::StructVector)
-    cols = fieldarrays(s)
-    names = propertynames(cols)
-    types = map(eltype, cols) 
-    Tables.Schema(names, types)
-end
+Tables.schema(s::StructVector) = Tables.Schema(eltype(s))