[I] Deeply nested structs cause long compilation times [arrow-julia]

["xitology (via GitHub)" <gi...@apache.org>]

xitology opened a new issue, #503:
URL: https://github.com/apache/arrow-julia/issues/503

   Arrow tables with deeply nested lists and structs can make Arrow.jl spend too much time in compilation.
   
   I uploaded an *empty* Arrow table that can trigger this behavior: [observation.empty.arrow.gz](https://github.com/apache/arrow-julia/files/14629731/observation.empty.arrow.gz)
   
   A simple program that reads this table and writes it again can take several minutes:
   ```
   julia -e 'using Arrow; t = Arrow.Table("observation.empty.arrow", convert = false); @time Arrow.write("copy-of-observation.empty.arrow", t)'
   250.863146 seconds (58.05 M allocations: 3.791 GiB, 1.07% gc time, 99.99% compilation time)
   ```
   
   Using Julia 1.10.2 and Arrow 2.7.1.


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Re: [I] Deeply nested structs cause long compilation times [arrow-julia]

["Moelf (via GitHub)" <gi...@apache.org>]

Moelf commented on issue #503:
URL: https://github.com/apache/arrow-julia/issues/503#issuecomment-2002718521

   second this. We see extremely high latency when doing CI: https://github.com/JuliaHEP/UnROOT.jl/actions/runs/8317241942/job/22757761446#step:6:548


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Re: [I] Deeply nested structs cause long compilation times [arrow-julia]

["xitology (via GitHub)" <gi...@apache.org>]

xitology commented on issue #503:
URL: https://github.com/apache/arrow-julia/issues/503#issuecomment-2005637391

   @Moelf, you made a point that IO with Arrow requires materializing exact field types, otherwise it would be slow. This is not so. Rust is capable of reading and writing Arrow data of arbitrary form, and can do it fast despite being a statically compiled language. People write SQL engines over Arrow in Rust, and they certainly don't know the type of each table and each column in advance. They can do it because in a column-oriented layout any data is ultimately stored as a collection of arrays of primitive types. By reducing any operation on composite data to operations on the underlying primitive arrays, they can process data effectively even if they don't know the exact layout of the composite fields during compilation.
   
   DataFrames API does it exactly right by making the step of materializing the row type explicit. The user can request it and pay the compilation cost if they want to process a DataFrame as a vector of tuples, but that's their choice. In fact, Arrow.jl works exactly the same, but only with top-level Table objects, and not with fields of composite types. Which is a problem, as my bug report demonstrates.
   
   What I would propose... support two variants of each composite array type: transparent and opaque.  The transparent is the current one while the opaque would hide the type of its content. The current definitions almost work, if we represent, say, an opaque Struct array as `Arrow.Struct{Any, Any, Any}`. We will only need to add a field to store column names (and allow `data` to be a vector). The API could provide a way to switch between transparent and opaque forms, but I'd argue the opaque form should be the default: this way you could read and process any Arrow data compilation-free.


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Re: [I] Deeply nested structs cause long compilation times [arrow-julia]

["xitology (via GitHub)" <gi...@apache.org>]

xitology commented on issue #503:
URL: https://github.com/apache/arrow-julia/issues/503#issuecomment-2004181888

   > they kind of have to -- the type tree has to exist somewhere, in Julia, it's natural to let the type tree exists using Julia's typing functionality. But we could have precompiled more in Arrow
   
   You don't have to create an exact Julia type for composite fields. After all, you do not create a Julia type for the table as a whole.


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Re: [I] Deeply nested structs cause long compilation times [arrow-julia]

["xitology (via GitHub)" <gi...@apache.org>]

xitology commented on issue #503:
URL: https://github.com/apache/arrow-julia/issues/503#issuecomment-2004408145

   > right, alternative to using Julia's typing system, is to use values, conceptually it's like instead of NamedTuple, just use `Dict` for the type tree. But then, reading bytes from disk or network I/O will be much slower because Julia won't know what bytes will turn into.
   
   That's just not true for a column-oriented data format like Arrow. The whole point of column layout is to make processing fast without knowing the exact data layout during compilation. Otherwise, statically compiled languages like C or Rust wouldn't be able to process Arrow data fast.


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Re: [I] Deeply nested structs cause long compilation times [arrow-julia]

["Moelf (via GitHub)" <gi...@apache.org>]

Moelf commented on issue #503:
URL: https://github.com/apache/arrow-julia/issues/503#issuecomment-2004144414

   they kind of have to -- the type tree has to exist somewhere, in Julia, it's natural to let the type tree exists using Julia's typing functionality. But we could have precompiled more in Arrow


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Re: [I] Deeply nested structs cause long compilation times [arrow-julia]

["Moelf (via GitHub)" <gi...@apache.org>]

Moelf commented on issue #503:
URL: https://github.com/apache/arrow-julia/issues/503#issuecomment-2004544872

   It's similar to why naive `for row in eachrow(df::DataFrame)` is slow, but if you use `DataFramesMeta.jl` or convert to a `TypedTable` from `TypedTables.jl` the row iteration would be faster again.
   
   In C or Rust, you need to know the column type at compile time, you can just do:
   ```
   auto df = openarrow(path)
   auto col = df.mycol1
   auto val = col[1]
   ```
   
   but you can do the moral equivalent of this in Julia. Fundamentally, the type information (schema) of the Arrow table lives as "values" (bytes) on-disk, you have to somehow process that info and at run-time generate a type tree -- using Julia's typing system or using Dict is implementation detail.
   
   For Rust and C, it's still doing this type of thing, but in more staged-fashion and probably more efficient, wheres in Arrow.jl I think it really leans heavily on Julia's typing system and compose everything using Julia type composition -- which may not have been smart from the result.


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Re: [I] Deeply nested structs cause long compilation times [arrow-julia]

["KristofferC (via GitHub)" <gi...@apache.org>]

KristofferC commented on issue #503:
URL: https://github.com/apache/arrow-julia/issues/503#issuecomment-2003404023

   There are some epic types getting compiled here. For example, here is the show method:
   
   ```
   precompile(Tuple{typeof(Base.show), Base.IOContext{Base.GenericIOBuffer{Array{UInt8, 1}}}, Base.Multimedia.MIME{Symbol("text/plain")}, Tables.Schema{(:resourceType, :id, :meta, :implicitRules, :language, :text, :contained, :extension, :modifierExtension, :identifier, :basedOn, :partOf, :status, :category, :code, :subject, :focus, :encounter, :effectiveDateTime, :effectivePeriod, :effectiveTiming, :effectiveInstant, :issued, :performer, :valueQuantity, :valueCodeableConcept, :valueString, :valueBoolean, :valueInteger, :valueRange, :valueRatio, :valueSampledData, :valueTime, :valueDateTime, :valuePeriod, :dataAbsentReason, :interpretation, :note, :bodySite, :method, :specimen, :device, :referenceRange, :hasMember, :derivedFrom, :component, :yy__patient_id, :yy_system, :yy_sub_resource), Tuple{Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :versionId, :lastUpdated, :source, :profile, :security, :tag), Tuple{Union{Base.Missin
 g, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}, Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Array{Union{Base.Missing, NamedTuple{(:id, :extension, :system, :version, :code, :display, :userSelected), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, Bool}}}}, 1}}, Union{Base.Missing, Array{Union{Base.Missing, NamedTuple{(:id, :extension, :system, :version, :code, :display, :userSelected), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union
 {Base.Missing, Bool}}}}, 1}}}}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :status, :div), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}}}}, Union{Base.Missing, Base.SubArray{Union{Base.Missing, String}, 1, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Tuple{Base.UnitRange{Int64}}, true}}, Union{Base.Missing, Base.SubArray{Union{Base.Missing, String}, 1, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Tuple{Base.UnitRange{Int64}}, true}}, Union{Base.Missing, Base.SubArray{Union{Base.Missing, String}, 1, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Tuple{Base.UnitRange{Int64}}, true}}, Union{Base.Missing, Base.SubArray{Union{Base.Missing, NamedTuple{(:id, :extension, :use, :type, :system, :value, :period, :assigner), Tuple{Union{Base.Missing, String}, Union{Bas
 e.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :coding, :text), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Array{Union{Base.Missing, NamedTuple{(:id, :extension, :system, :version, :code, :display, :userSelected), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, Bool}}}}, 1}}, Union{Base.Missing, String}}}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :start, :end), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}, Union{Base.Missing, Arrow.Timestamp{Arrow.F
 latbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}}}}, Union{Base.Missing, NamedTuple{(:id, :extension, :reference, :type, :identifier, :display), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :use, :type, :system, :value, :period, :assigner), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :coding, :text), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Array{Union{Base.Missing, NamedTuple{(:id, :extension, :system, :version, :code, :display, :userSelected), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{B
 ase.Missing, String}, Union{Base.Missing, Bool}}}}, 1}}, Union{Base.Missing, String}}}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :start, :end), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}, Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}}}}, Union{Base.Missing, String}}}}, Union{Base.Missing, String}}}}}}}, 1, Arrow.Struct{Union{Base.Missing, NamedTuple{(:id, :extension, :use, :type, :system, :value, :period, :assigner), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :coding, :text), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Array{Union{Base.M
 issing, NamedTuple{(:id, :extension, :system, :version, :code, :display, :userSelected), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, Bool}}}}, 1}}, Union{Base.Missing, String}}}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :start, :end), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}, Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}}}}, Union{Base.Missing, NamedTuple{(:id, :extension, :reference, :type, :identifier, :display), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.M
 issing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :use, :type, :system, :value, :period, :assigner), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :coding, :text), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Array{Union{Base.Missing, NamedTuple{(:id, :extension, :system, :version, :code, :display, :userSelected), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, Bool}}}}, 1}}, Union{Base.Missing, String}}}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :start, :end), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{B
 ase.Missing, String}, 1}}, Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}, Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}}}}, Union{Base.Missing, String}}}}, Union{Base.Missing, String}}}}}}}, Tuple{Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, Base.SubArray{Union{Base.Missing, String}, 1, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Tuple{Base.UnitRange{Int64}}, true}}, Int32, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}}, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.Struct{Union{Base.Missing, NamedTuple{(:id, :extension, :coding, :text), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Array{Union{Base.Missing, NamedTuple{(:id, :extension, :system, :version, :code, :display, :userSelected), Tuple{Union{Base.Missing, St
 ring}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, Bool}}}}, 1}}, Union{Base.Missing, String}}}}, Tuple{Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, Base.SubArray{Union{Base.Missing, String}, 1, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Tuple{Base.UnitRange{Int64}}, true}}, Int32, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}}, Arrow.List{Union{Base.Missing, Base.SubArray{Union{Base.Missing, NamedTuple{(:id, :extension, :system, :version, :code, :display, :userSelected), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, Bool}}}}, 1, Arrow.Struct{Union{Base.Missing, 
 NamedTuple{(:id, :extension, :system, :version, :code, :display, :userSelected), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, Bool}}}}, Tuple{Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, Base.SubArray{Union{Base.Missing, String}, 1, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Tuple{Base.UnitRange{Int64}}, true}}, Int32, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}}, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.BoolVector{Union{Base.Missing, Bool}}}, (:id, :extension, :system, :version, :code, :
 display, :userSelected)}, Tuple{Base.UnitRange{Int64}}, true}}, Int32, Arrow.Struct{Union{Base.Missing, NamedTuple{(:id, :extension, :system, :version, :code, :display, :userSelected), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, Bool}}}}, Tuple{Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, Base.SubArray{Union{Base.Missing, String}, 1, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Tuple{Base.UnitRange{Int64}}, true}}, Int32, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}}, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, String}, Int32, Array
 {UInt8, 1}}, Arrow.BoolVector{Union{Base.Missing, Bool}}}, (:id, :extension, :system, :version, :code, :display, :userSelected)}}, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}}, (:id, :extension, :coding, :text)}, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.Struct{Union{Base.Missing, NamedTuple{(:id, :extension, :start, :end), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}, Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}}}}, Tuple{Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, Base.SubArray{Union{Base.Missing, String}, 1, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Tuple{Base.UnitRange{Int64}}, true}}, Int32, Arrow.List{Union{Ba
 se.Missing, String}, Int32, Array{UInt8, 1}}}, Arrow.Primitive{Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}, Array{Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}, 1}}, Arrow.Primitive{Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}, Array{Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}, 1}}}, (:id, :extension, :start, :end)}, Arrow.Struct{Union{Base.Missing, NamedTuple{(:id, :extension, :reference, :type, :identifier, :display), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :use, :type, :system, :value, :period, :assigner), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :coding,
  :text), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Array{Union{Base.Missing, NamedTuple{(:id, :extension, :system, :version, :code, :display, :userSelected), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, Bool}}}}, 1}}, Union{Base.Missing, String}}}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, NamedTuple{(:id, :extension, :start, :end), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}, Union{Base.Missing, Arrow.Timestamp{Arrow.Flatbuf.TimeUnit.T(0x0002), Symbol("Etc/UTC")}}}}}, Union{Base.Missing, String}}}}, Union{Base.Missing, String}}}}, Tuple{Arrow.List{Union
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 8, 1}}}, (:id, :extension, :coding, :text)}}, Arrow.Struct{Union{Base.Missing, NamedTuple{(:id, :extension, :low, :high), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, NamedTuple{(:id, :extension, :value, :comparator, :unit, :system, :code), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Float32}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}}}}, Union{Base.Missing, NamedTuple{(:id, :extension, :value, :comparator, :unit, :system, :code), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Float32}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}}}}}}}, Tuple{Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing,
  Base.SubArray{Union{Base.Missing, String}, 1, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Tuple{Base.UnitRange{Int64}}, true}}, Int32, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}}, Arrow.Struct{Union{Base.Missing, NamedTuple{(:id, :extension, :value, :comparator, :unit, :system, :code), Tuple{Union{Base.Missing, String}, Union{Base.Missing, Array{Union{Base.Missing, String}, 1}}, Union{Base.Missing, Float32}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}}}}, Tuple{Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Arrow.List{Union{Base.Missing, Base.SubArray{Union{Base.Missing, String}, 1, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}, Tuple{Base.UnitRange{Int64}}, true}}, Int32, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}}, Arrow.Primitive{Union{Base.Missing, Float32}, Array{Float32, 1}}, Vararg{Arrow.List{Union{Base.Miss
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 :extension, :low, :high)}, Arrow.List{Union{Base.Missing, String}, Int32, Array{UInt8, 1}}}, (:id, :extension, :modifierExtension, :low, :high, :type, :appliesTo, :age, :text)}}}, (:id, :extension, :modifierExtension, :code, :valueQuantity, :valueCodeableConcept, :valueString, :valueBoolean, :valueInteger, :valueRange, :valueRatio, :valueSampledData, :valueTime, :valueDateTime, :valuePeriod, :dataAbsentReason, :interpretation, :referenceRange)}, Tuple{Base.UnitRange{Int64}}, true}}, Union{Base.Missing, String}, Union{Base.Missing, String}, Union{Base.Missing, String}}}})
   ```
   
   That line is 234870 characters.


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Re: [I] Deeply nested structs cause long compilation times [arrow-julia]

["xitology (via GitHub)" <gi...@apache.org>]

xitology commented on issue #503:
URL: https://github.com/apache/arrow-julia/issues/503#issuecomment-2004028175

   
   > There are some epic types getting compiled here.
   
   Perhaps, composite arrow arrays should not carry the types of the underlying data arrays in their own type signature?


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Re: [I] Deeply nested structs cause long compilation times [arrow-julia]

["Moelf (via GitHub)" <gi...@apache.org>]

Moelf commented on issue #503:
URL: https://github.com/apache/arrow-julia/issues/503#issuecomment-2004354416

   right, alternative to using Julia's typing system, is to use values, conceptually it's like instead of NamedTuple, just use `Dict` for the type tree. But then, reading bytes from disk or network I/O will be much slower because Julia won't know what bytes will turn into.
   
   In that case people may start to complain why Arrow is so slow or type unstable, idk, we need to try to see the tradeoffs


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