Merge pull request #65 from ceferisbarov/rowtable

Add RowTable and ColTable

Author: juliohm

docs/src/transforms/builtin.md

@@ -50,6 +50,17 @@ Coalesce
 Coerce
 ```
 
+## RowTable
+
+```@docs
+RowTable
+```
+
+## ColTable
+```@docs
+ColTable
+```
+
 ## Identity
 
 ```@docs

src/TableTransforms.jl

@@ -34,6 +34,8 @@ export
   Replace,
   Coalesce,
   Coerce,
+  RowTable,
+  ColTable,
   Identity,
   Center,
   Scale,

src/transforms.jl

@@ -217,6 +217,8 @@ include("transforms/rename.jl")
 include("transforms/replace.jl")
 include("transforms/coalesce.jl")
 include("transforms/coerce.jl")
+include("transforms/rowtable.jl")
+include("transforms/coltable.jl")
 include("transforms/identity.jl")
 include("transforms/center.jl")
 include("transforms/scale.jl")

src/transforms/coltable.jl

@@ -0,0 +1,14 @@
+# ------------------------------------------------------------------
+# Licensed under the MIT License. See LICENSE in the project root.
+# ------------------------------------------------------------------
+
+"""
+    ColTable()
+
+The transform that applies the function `Tables.columntable` to to the input table.
+"""
+struct ColTable <: Stateless end
+
+apply(::ColTable, table) = Tables.columntable(table), table
+
+revert(::ColTable, newtable, cache) = cache

src/transforms/rowtable.jl

@@ -0,0 +1,14 @@
+# ------------------------------------------------------------------
+# Licensed under the MIT License. See LICENSE in the project root.
+# ------------------------------------------------------------------
+
+"""
+    RowTable()
+
+The transform that applies the function `Tables.rowtable` to to the input table.
+"""
+struct RowTable <: Stateless end
+
+apply(::RowTable, table) = Tables.rowtable(table), table
+
+revert(::RowTable, newtable, cache) = cache

test/transforms.jl

@@ -859,6 +859,32 @@
     @test rt == rtₒ
   end
 
+  @testset "RowTable" begin
+    a = [3, 2, 1, 4, 5, 3]
+    b = [1, 4, 4, 5, 8, 5]
+    c = [1, 1, 6, 2, 4, 1]
+    t = Table(; a, b, c)
+    T = RowTable()
+    n, c = apply(T, t)
+    tₒ = revert(T, n, c)
+    @test typeof(n) <: Vector
+    @test Tables.rowaccess(n)
+    @test typeof(tₒ) <: Table
+  end
+
+  @testset "ColTable" begin
+    a = [3, 2, 1, 4, 5, 3]
+    b = [1, 4, 4, 5, 8, 5]
+    c = [1, 1, 6, 2, 4, 1]
+    t = Table(; a, b, c)
+    T = ColTable()
+    n, c = apply(T, t)
+    tₒ = revert(T, n, c)
+    @test typeof(n) <: NamedTuple
+    @test Tables.columnaccess(n)
+    @test typeof(tₒ) <: Table
+  end
+
   @testset "Identity" begin
     x = rand(4000)
     y = rand(4000)