Merge pull request #99 from TidierOrg/fix-distinct-multiple-columns

Bug fix to allow multiple columns to `@distinct()`. Bumped version to 0.7.6.

NEWS.md

@@ -1,5 +1,8 @@
 # Tidier.jl updates
 
+## v0.7.6 - 2023-05-04
+- Fixed bug to allow multiple columns in `@distinct()` separated by commas or using selection helpers.
+
 ## v0.7.5 - 2023-04-30
 - Fixed bug to ensure that `&&` and `||` are auto-vectorized
 - Added docstrings and examples to show different ways of filtering by multiple "and" conditions, including `&&`, `&`, and separating multiple expressions with commas.

Project.toml

@@ -1,7 +1,7 @@
 name = "Tidier"
 uuid = "f0413319-3358-4bb0-8e7c-0c83523a93bd"
 authors = ["Karandeep Singh"]
-version = "0.7.5"
+version = "0.7.6"
 
 [deps]
 Chain = "8be319e6-bccf-4806-a6f7-6fae938471bc"

src/Tidier.jl

@@ -567,7 +567,13 @@ macro distinct(df, exprs...)
             _
           end    
         end
-        unique($(tidy_exprs...))
+        @chain _ begin
+          if length([$tidy_exprs...]) == 0
+            unique(_)
+          else
+            unique(_, Cols($(tidy_exprs...)))
+          end
+        end
         select(Cols(Not(r"^(Tidier_n|Tidier_row_number)$")))
         groupby(col_names; sort = true) # regroup
       end
@@ -587,7 +593,13 @@ macro distinct(df, exprs...)
             _
           end
         end
-        unique($(tidy_exprs...))
+        @chain _ begin
+          if length([$tidy_exprs...]) == 0
+            unique(_)
+          else
+            unique(_, Cols($(tidy_exprs...)))
+          end
+        end
         select(Cols(Not(r"^(Tidier_n|Tidier_row_number)$")))
       end
     end

src/docstrings.jl

@@ -712,7 +712,7 @@ If no columns or expressions are provided, then unique rows across all columns a
 
 # Examples
 ```jldoctest
-julia> df = DataFrame(a = repeat('a':'e', inner = 2), b = 1:10, c = 11:20);
+julia> df = DataFrame(a = repeat('a':'e', inner = 2), b = repeat(1:5, 2), c = 11:20);
   
 julia> @chain df begin
        @distinct()
@@ -726,11 +726,11 @@ julia> @chain df begin
    3 │ b         3     13
    4 │ b         4     14
    5 │ c         5     15
-   6 │ c         6     16
-   7 │ d         7     17
-   8 │ d         8     18
-   9 │ e         9     19
-  10 │ e        10     20
+   6 │ c         1     16
+   7 │ d         2     17
+   8 │ d         3     18
+   9 │ e         4     19
+  10 │ e         5     20
 
 julia> @chain df begin
        @distinct(a)
@@ -742,8 +742,39 @@ julia> @chain df begin
    1 │ a         1     11
    2 │ b         3     13
    3 │ c         5     15
-   4 │ d         7     17
-   5 │ e         9     19
+   4 │ d         2     17
+   5 │ e         4     19
+
+julia> @chain df begin
+       @distinct(starts_with("a"))
+       end
+5×3 DataFrame
+ Row │ a     b      c     
+     │ Char  Int64  Int64 
+─────┼────────────────────
+   1 │ a         1     11
+   2 │ b         3     13
+   3 │ c         5     15
+   4 │ d         2     17
+   5 │ e         4     19
+
+julia> @chain df begin
+       @distinct(a, b)
+       end
+10×3 DataFrame
+ Row │ a     b      c     
+     │ Char  Int64  Int64 
+─────┼────────────────────
+   1 │ a         1     11
+   2 │ a         2     12
+   3 │ b         3     13
+   4 │ b         4     14
+   5 │ c         5     15
+   6 │ c         1     16
+   7 │ d         2     17
+   8 │ d         3     18
+   9 │ e         4     19
+  10 │ e         5     20
 ```
 """