Fix mapreduce type-stability on Julia 1.10 using @generated functions#499
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ChrisRackauckas merged 8 commits intoSciML:masterfrom Dec 14, 2025
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A function similar to what is implemented commit 2094a78 but for NamedArrayPartitions rather than ArrayPartitions. Tested privately to work with Implicit solvers in OrdinaryDiffEq.jl
NamedArrayPartition zeromatrix
- Use @generated functions (_mapreduce_impl and _mapreduce_impl_init) to ensure type-stable mapreduce for ArrayPartition on Julia 1.10 - The generated approach unrolls the tuple iteration at compile time, avoiding type inference issues with kwargs that affected Julia 1.10 - Preserves correct `init` parameter semantics (init applied once at outer level) - Add missing ArrayInterface import in named_array_partition_tests.jl This fixes the type inference failure where Julia 1.10 would infer `Any` instead of the correct concrete return type for mapreduce operations on nested ArrayPartitions. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
This PR fixes the type-stability issue in
mapreduceforArrayPartitionon Julia 1.10 that was blocking PR #444.Problem
The
mapreducefunction was not type-stable on Julia 1.10. The issue was caused by type inference problems with kwargs and closures in generator expressions. While Julia 1.11 handled this correctly, Julia 1.10 would inferAnyinstead of the concrete return type.Solution
@generatedfunctions (_mapreduce_impland_mapreduce_impl_init) to unroll the tuple iteration at compile timeinitparameter semantics (init applied once at the outer level, not per-partition)Additional Fix
ArrayInterfaceimport intest/named_array_partition_tests.jlTest Results
Test plan
Pkg.test()on Julia 1.10Pkg.test()on Julia 1.11@inferred sum(ArrayPartition(ArrayPartition(zeros(4,4))))returnsFloat64🤖 Generated with Claude Code