Tables interface

Project.toml

@@ -12,6 +12,7 @@ NestedTuples = "a734d2a7-8d68-409b-9419-626914d4061d"
 Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 StatsBase = "2913bbd2-ae8a-5f71-8c99-4fb6c76f3a91"
 StructArrays = "09ab397b-f2b6-538f-b94a-2f83cf4a842a"
+Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
 
 [compat]
 ArraysOfArrays = "0.5"

src/tables.jl

@@ -0,0 +1,36 @@
+import Tables
+
+Tables.isrowtable(::Type{<:TupleVector}) = true
+
+Tables.columnaccess(::Type{<:TupleVectors}) = true
+Tables.columns(tv::TupleVector) = unwrap(tv)
+
+
+
+Tables.schema(s::TupleVector{T,X}) where {T,X} = Tables.Schema(T)
+
+
+# Adapted from StructVectors.jl
+function try_compatible_columns(rows::R, s::TupleVector) where {R}
+    Tables.isrowtable(rows) && Tables.columnaccess(rows) || return nothing
+    T = eltype(rows)
+    hasfields(T) || return nothing
+    NT = StructArrays.staticschema(T)
+    StructArrays._schema(NT) == Tables.schema(rows) || return nothing
+    return Tables.columntable(rows)
+end
+
+# Adapted from StructVectors.jl
+function Base.append!(s::TupleVector, rows)
+    table = try_compatible_columns(rows, s)
+    if table !== nothing
+        # Input `rows` is a container of rows _and_ satisfies column
+        # table interface.  Thus, we can add the input column-by-column.
+        foreachfield(append!, s, table)
+        return s
+    else
+        # Otherwise, fallback to a generic implementation expecting
+        # that `rows` is an iterator:
+        return foldl(push!, rows; init = s)
+    end
+end

src/tuplevector.jl

@@ -8,6 +8,8 @@ struct TupleVector{T,X} <: AbstractVector{T}
     data :: X
 end
 
+Base.ismutable(::TupleVector) = true
+
 NestedTuples.unwrap(tv::TupleVector) = getfield(tv, :data)
 
 function TupleVector(data::X) where {X <: NamedTuple}