perf: Concretely typed TopK StringHeap, and StringHashTable slot reuse - #24105

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MassivePizza wants to merge 15 commits into

apache:mainfrom

massive-com:topk-mutable-borrow-slots

Commits on Aug 27, 2026

store concrete string type in TopK hash-table
MassivePizza
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c00de4b
Undo StringArrayType convenience check,
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b54c45e
move ID nullability into HashTableItem
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f54197a
respect null properly in TopKHashTable::null_map_idxs
MassivePizza
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e1f8dd5
concretely typed TopK ArrowHeap storage
MassivePizza
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711bbc5
reuse (String) allocs in TopKHashTable
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fe45592
add use_free_slots comment
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48fb532
fix clippy
MassivePizza
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ddbc1f5
use cast instead of from(to_data)
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d49a9c4
fix fmt
MassivePizza
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635a790
Store exact type in TopKHeap and TopKHashTable.
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06e34f7
inline TopKHeap swap
MassivePizza
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a6fbb6c
do not store mapping on drain
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02db8e2
extend with pair instead of pushing
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539f8a9
enforce tail-call opt
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5fd2a17