Add Dagger.File loading support

Author: jpsamaroo

Project.toml

@@ -14,7 +14,7 @@ TableOperations = "ab02a1b2-a7df-11e8-156e-fb1833f50b87"
 Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
 
 [compat]
-Dagger = "0.16.1, 0.17"
+Dagger = "0.18"
 DataAPI = "1"
 DataFrames = "1.4"
 InvertedIndices = "1"

src/table/dtable.jl

@@ -1,4 +1,5 @@
-const VTYPE = Vector{Union{Dagger.Chunk,Dagger.EagerThunk}}
+const ELTYPE = Union{Dagger.Chunk,Dagger.EagerThunk}
+const VTYPE = Vector{ELTYPE}
 
 """
     DTable
@@ -153,6 +154,11 @@ function _file_load(filename::AbstractString, loader_function::Function, tablety
     return tpart
 end
 
+function DTable(files::Vector{Dagger.File}; tabletype=nothing)
+    chunks = ELTYPE[file.chunk for file in files]
+    return DTable(chunks, tabletype)
+end
+
 """
     fetch(d::DTable)