-
Notifications
You must be signed in to change notification settings - Fork 367
/
broadcasting.jl
390 lines (349 loc) · 14.6 KB
/
broadcasting.jl
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
### Broadcasting
Base.getindex(df::AbstractDataFrame, idx::CartesianIndex{2}) = df[idx[1], idx[2]]
Base.view(df::AbstractDataFrame, idx::CartesianIndex{2}) = view(df, idx[1], idx[2])
Base.setindex!(df::AbstractDataFrame, val, idx::CartesianIndex{2}) =
(df[idx[1], idx[2]] = val)
Base.broadcastable(df::AbstractDataFrame) = df
struct DataFrameStyle <: Base.Broadcast.BroadcastStyle end
Base.Broadcast.BroadcastStyle(::Type{<:AbstractDataFrame}) =
DataFrameStyle()
Base.Broadcast.BroadcastStyle(::DataFrameStyle, ::Base.Broadcast.BroadcastStyle) =
DataFrameStyle()
Base.Broadcast.BroadcastStyle(::Base.Broadcast.BroadcastStyle, ::DataFrameStyle) =
DataFrameStyle()
Base.Broadcast.BroadcastStyle(::DataFrameStyle, ::DataFrameStyle) = DataFrameStyle()
# The method below is added to avoid dispatch ambiguity
Base.Broadcast.BroadcastStyle(::DataFrameStyle, ::Base.Broadcast.Unknown) =
DataFrameStyle()
function copyto_widen!(res::AbstractVector{T}, bc::Base.Broadcast.Broadcasted,
pos, col) where T
for i in pos:length(axes(bc)[1])
val = bc[CartesianIndex(i, col)]
S = typeof(val)
if S <: T || promote_type(S, T) <: T
res[i] = val
else
newres = similar(Vector{promote_type(S, T)}, length(res))
copyto!(newres, 1, res, 1, i-1)
newres[i] = val
return copyto_widen!(newres, bc, i + 1, col)
end
end
return res
end
function getcolbc(bcf::Base.Broadcast.Broadcasted{Style}, colind) where {Style}
# we assume that bcf is already flattened and unaliased
newargs = map(bcf.args) do x
Base.Broadcast.extrude(x isa AbstractDataFrame ? x[!, colind] : x)
end
return Base.Broadcast.Broadcasted{Style}(bcf.f, newargs, bcf.axes)
end
function Base.copy(bc::Base.Broadcast.Broadcasted{DataFrameStyle})
ndim = length(axes(bc))
if ndim != 2
throw(DimensionMismatch("cannot broadcast a data frame into $ndim dimensions"))
end
bcf = Base.Broadcast.flatten(bc)
colnames = unique!(Any[_names(df) for df in bcf.args if df isa AbstractDataFrame])
if length(colnames) != 1
wrongnames = setdiff(union(colnames...), intersect(colnames...))
if isempty(wrongnames)
throw(ArgumentError("Column names in broadcasted data frames " *
"must have the same order"))
else
msg = join(wrongnames, ", ", " and ")
throw(ArgumentError("Column names in broadcasted data frames must match. " *
"Non matching column names are $msg"))
end
end
nrows = length(axes(bcf)[1])
df = DataFrame()
for i in axes(bcf)[2]
if nrows == 0
col = Any[]
else
bcf′ = getcolbc(bcf, i)
v1 = bcf′[CartesianIndex(1, i)]
startcol = similar(Vector{typeof(v1)}, nrows)
startcol[1] = v1
col = copyto_widen!(startcol, bcf′, 2, i)
end
df[!, colnames[1][i]] = col
end
dfs = AbstractDataFrame[df for df in bcf.args if df isa AbstractDataFrame]
@assert !isempty(dfs)
_merge_matching_table_note_metadata!(df, dfs)
if all(x -> !isempty(colmetadatakeys(x)), dfs)
for colname in _names(df)
if length(dfs) == 1
_copy_col_note_metadata!(df, colname, only(dfs), colname)
else
if all(x -> !isempty(colmetadatakeys(x, colname)), dfs)
for key1 in colmetadatakeys(dfs[1], colname)
val1, style1 = colmetadata(dfs[1], colname, key1, style=true)
if style1 === :note
add_meta = true
for i in 2:length(dfs)
if key1 in colmetadatakeys(dfs[i], colname)
vali, stylei = colmetadata(dfs[i], colname, key1, style=true)
if !(stylei === :note && isequal(val1, vali))
add_meta = false
break
end
else
add_meta = false
break
end
end
add_meta && colmetadata!(df, colname, key1, val1, style=:note)
end
end
end
end
end
end
return df
end
### Broadcasting assignment
struct LazyNewColDataFrame{T,D}
df::D
col::T
end
Base.axes(x::LazyNewColDataFrame) = (Base.OneTo(nrow(x.df)),)
Base.ndims(::Type{<:LazyNewColDataFrame}) = 1
struct ColReplaceDataFrame{T<:AbstractDataFrame}
df::T
cols::Vector{Int}
end
Base.axes(x::ColReplaceDataFrame) = (axes(x.df, 1), Base.OneTo(length(x.cols)))
Base.ndims(::Type{<:ColReplaceDataFrame}) = 2
# In the functions below we need to call _drop_all_nonnote_metadata!
# upfront as the rest of the operations is handled by Base Julia
function Base.maybeview(df::AbstractDataFrame, idx::CartesianIndex{2})
_drop_all_nonnote_metadata!(parent(df))
return df[idx]
end
function Base.maybeview(df::AbstractDataFrame, row::Integer, col::ColumnIndex)
_drop_all_nonnote_metadata!(parent(df))
return df[row, col]
end
function Base.maybeview(df::AbstractDataFrame, rows, cols)
_drop_all_nonnote_metadata!(parent(df))
return view(df, rows, cols)
end
function Base.dotview(df::AbstractDataFrame, ::Colon, cols::ColumnIndex)
if haskey(index(df), cols)
_drop_all_nonnote_metadata!(parent(df))
return view(df, :, cols)
end
if !(cols isa SymbolOrString)
throw(ArgumentError("creating new columns using an integer index is disallowed"))
end
if !is_column_insertion_allowed(df)
throw(ArgumentError("creating new columns in a SubDataFrame that subsets " *
"columns of its parent data frame is disallowed"))
end
return LazyNewColDataFrame(df, Symbol(cols))
end
function Base.dotview(df::AbstractDataFrame, ::typeof(!), cols)
if !(cols isa ColumnIndex)
return ColReplaceDataFrame(df, convert(Vector{Int}, index(df)[cols]))
end
if cols isa SymbolOrString
if columnindex(df, cols) == 0 && !is_column_insertion_allowed(df)
throw(ArgumentError("creating new columns in a SubDataFrame that subsets " *
"columns of its parent data frame is disallowed"))
end
elseif !(1 <= cols <= ncol(df))
throw(ArgumentError("creating new columns using an integer index is disallowed"))
end
return LazyNewColDataFrame(df, cols isa AbstractString ? Symbol(cols) : cols)
end
if isdefined(Base, :dotgetproperty) # Introduced in Julia 1.7
function Base.dotgetproperty(df::AbstractDataFrame, col::SymbolOrString)
if columnindex(df, col) == 0 && !is_column_insertion_allowed(df)
throw(ArgumentError("creating new columns in a SubDataFrame that subsets " *
"columns of its parent data frame is disallowed"))
end
return LazyNewColDataFrame(df, Symbol(col))
end
end
function Base.copyto!(lazydf::LazyNewColDataFrame, bc::Base.Broadcast.Broadcasted{T}) where T
df = lazydf.df
if !haskey(index(df), lazydf.col) && df isa SubDataFrame && lazydf.col isa SymbolOrString
@assert is_column_insertion_allowed(df)
end
if bc isa Base.Broadcast.Broadcasted{<:Base.Broadcast.AbstractArrayStyle{0}}
bc_tmp = Base.Broadcast.Broadcasted{T}(bc.f, bc.args, ())
v = Base.Broadcast.materialize(bc_tmp)
col = similar(Vector{typeof(v)}, nrow(df))
copyto!(col, bc)
else
col = Base.Broadcast.materialize(bc)
end
return df[!, lazydf.col] = col
end
function _copyto_helper!(dfcol::AbstractVector, bc::Base.Broadcast.Broadcasted, col::Int)
if axes(dfcol, 1) != axes(bc)[1]
# this should never happen unless data frame is corrupted (has unequal column lengths)
throw(DimensionMismatch("Dimension mismatch in broadcasting. The updated" *
" data frame is invalid and should not be used"))
end
@inbounds for row in eachindex(dfcol)
dfcol[row] = bc[CartesianIndex(row, col)]
end
end
function Base.Broadcast.broadcast_unalias(dest::AbstractDataFrame, src)
for col in eachcol(dest)
src = Base.Broadcast.unalias(col, src)
end
return src
end
# The method below is added to avoid dispatch ambiguity
Base.Broadcast.broadcast_unalias(::Nothing, src::AbstractDataFrame) = src
function Base.Broadcast.broadcast_unalias(dest, src::AbstractDataFrame)
wascopied = false
for (i, col) in enumerate(eachcol(src))
if Base.mightalias(dest, col)
if src isa SubDataFrame
if !wascopied
src = SubDataFrame(copy(parent(src), copycols=false),
index(src), rows(src))
end
parentidx = parentcols(index(src), i)
parent(src)[!, parentidx] = Base.unaliascopy(parent(src)[!, parentidx])
else
if !wascopied
src = copy(src, copycols=false)
end
src[!, i] = Base.unaliascopy(col)
end
wascopied = true
end
end
return src
end
function _broadcast_unalias_helper(dest::AbstractDataFrame, scol::AbstractVector,
src::AbstractDataFrame, col2::Int, wascopied::Bool)
# col1 can be checked till col2 point as we are writing broadcasting
# results from 1 to ncol
# we go downwards because aliasing when col1 == col2 is most probable
for col1 in col2:-1:1
dcol = dest[!, col1]
if Base.mightalias(dcol, scol)
if src isa SubDataFrame
if !wascopied
src =SubDataFrame(copy(parent(src), copycols=false),
index(src), rows(src))
end
parentidx = parentcols(index(src), col2)
parent(src)[!, parentidx] = Base.unaliascopy(parent(src)[!, parentidx])
else
if !wascopied
src = copy(src, copycols=false)
end
src[!, col2] = Base.unaliascopy(scol)
end
return src, true
end
end
return src, wascopied
end
function Base.Broadcast.broadcast_unalias(dest::AbstractDataFrame, src::AbstractDataFrame)
if size(dest, 2) != size(src, 2)
throw(DimensionMismatch("Dimension mismatch in broadcasting."))
end
wascopied = false
for col2 in axes(dest, 2)
scol = src[!, col2]
src, wascopied = _broadcast_unalias_helper(dest, scol, src, col2, wascopied)
end
return src
end
function Base.copyto!(df::AbstractDataFrame, bc::Base.Broadcast.Broadcasted)
bcf = Base.Broadcast.flatten(bc)
colnames = unique!(Any[_names(x) for x in bcf.args if x isa AbstractDataFrame])
if length(colnames) > 1 || (length(colnames) == 1 && _names(df) != colnames[1])
push!(colnames, _names(df))
wrongnames = setdiff(union(colnames...), intersect(colnames...))
if isempty(wrongnames)
throw(ArgumentError("Column names in broadcasted data frames " *
"must have the same order"))
else
msg = join(wrongnames, ", ", " and ")
throw(ArgumentError("Column names in broadcasted data frames must match. " *
"Non matching column names are $msg"))
end
end
bcf′ = Base.Broadcast.preprocess(df, bcf)
for i in axes(df, 2)
_copyto_helper!(df[!, i], getcolbc(bcf′, i), i)
end
_drop_all_nonnote_metadata!(parent(df))
return df
end
function Base.copyto!(df::AbstractDataFrame,
bc::Base.Broadcast.Broadcasted{<:Base.Broadcast.AbstractArrayStyle{0}})
# special case of fast approach when bc is providing an untransformed scalar
if bc.f === identity && bc.args isa Tuple{Any} && Base.Broadcast.isflat(bc)
for col in axes(df, 2)
fill!(df[!, col], bc.args[1][])
end
return df
else
return copyto!(df, convert(Base.Broadcast.Broadcasted{Nothing}, bc))
end
end
create_bc_tmp(bcf′_col::Base.Broadcast.Broadcasted{T}) where {T} =
Base.Broadcast.Broadcasted{T}(bcf′_col.f, bcf′_col.args, ())
function Base.copyto!(crdf::ColReplaceDataFrame, bc::Base.Broadcast.Broadcasted)
bcf = Base.Broadcast.flatten(bc)
colnames = unique!(Any[_names(x) for x in bcf.args if x isa AbstractDataFrame])
if length(colnames) > 1 ||
(length(colnames) == 1 && view(_names(crdf.df), crdf.cols) != colnames[1])
push!(colnames, view(_names(crdf.df), crdf.cols))
wrongnames = setdiff(union(colnames...), intersect(colnames...))
if isempty(wrongnames)
throw(ArgumentError("Column names in broadcasted data frames " *
"must have the same order"))
else
msg = join(wrongnames, ", ", " and ")
throw(ArgumentError("Column names in broadcasted data frames must match. " *
"Non matching column names are $msg"))
end
end
bcf′ = Base.Broadcast.preprocess(crdf, bcf)
nrows = length(axes(bcf′)[1])
for (i, col_idx) in enumerate(crdf.cols)
bcf′_col = getcolbc(bcf′, i)
if bcf′_col isa Base.Broadcast.Broadcasted{<:Base.Broadcast.AbstractArrayStyle{0}}
bc_tmp = create_bc_tmp(bcf′_col)
v = Base.Broadcast.materialize(bc_tmp)
newcol = similar(Vector{typeof(v)}, nrow(crdf.df))
copyto!(newcol, bc)
else
if nrows == 0
newcol = Any[]
else
v1 = bcf′_col[CartesianIndex(1, i)]
startcol = similar(Vector{typeof(v1)}, nrows)
startcol[1] = v1
newcol = copyto_widen!(startcol, bcf′_col, 2, i)
end
end
crdf.df[!, col_idx] = newcol
end
return crdf.df
end
Base.Broadcast.broadcast_unalias(dest::DataFrameRow, src) =
Base.Broadcast.broadcast_unalias(parent(dest), src)
# this is currently impossible but is added to avoid potential dispatch ambiguity in the future
Base.Broadcast.broadcast_unalias(dest::DataFrameRow, src::AbstractDataFrame) =
Base.Broadcast.broadcast_unalias(parent(dest), src)
function Base.copyto!(dfr::DataFrameRow, bc::Base.Broadcast.Broadcasted)
bc′ = Base.Broadcast.preprocess(dfr, bc)
for I in eachindex(bc′)
dfr[I] = bc′[I]
end
return dfr
end