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Add rechunk function #237

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54f1d6a
Add rechunk function
felixcremer Feb 27, 2025
4e1bda7
Improve docstring of rechunk
felixcremer Mar 3, 2025
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16 changes: 15 additions & 1 deletion src/rechunk.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@
RechunkedDiskArray(parent::AbstractArray, chunks::GridChunks)

A disk array that forces a specific chunk pattern,
regardless of the true chunk pattern of the parnet array.
regardless of the true chunk pattern of the parent array.

This is useful in `zip` and other operations that can iterate
over multiple arrays with different patterns.
Expand All @@ -14,6 +14,20 @@ struct RechunkedDiskArray{T,N,A<:AbstractArray{T,N},C<:GridChunks} <: AbstractDi
chunks::C
end

"""
rechunk(data::AbstractArray,chunks)

Change the chunks of the underlying DiskArray. Note that this will not change the chunking of the underlying data itself, it will just make the data
"look" like it had a different chunking. If you need a persistent on-disk representation of this chunking, save the resulting array.

The chunks argument can take one of the following forms:

• a DiskArrays.GridChunks object

• a tuple specifying the chunk size along each dimension
"""
rechunk(data::AbstractDiskArray, chunks::GridChunks) = RechunkedDiskArray(data, chunks)

Base.parent(A::RechunkedDiskArray) = A.parent
Base.size(A::RechunkedDiskArray) = size(parent(A))

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