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apache
datafusion-comet
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feat: spilling shuffled hash join (research draft)
- #7057
#7057
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feat: spilling shuffled hash join (research draft)
#7057
andygrove
wants to merge 24 commits into
apache:main
apache/datafusion-comet:main
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andygrove:spilling-hash-join-research
andygrove/datafusion-comet:spilling-hash-join-research
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Commits on Oct 16, 2026
feat: add a shuffled hash join that spills its build side to disk
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feat: run native shuffled hash joins with the spilling join
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test: add a benchmark of hash and sort-merge joins under native memory budgets
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docs: add the spilling hash join design and document the join
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docs: record the spilling hash join's status and remaining work
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test: add a native benchmark of the spilling hash join
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perf: write a spilled bucket's rows in full batches
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test: compare the spilling join over more key and payload types
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perf: keep probe rows that match nothing off disk
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ci: run the spilling hash join suites in the PR builds
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test: spill a hash join that the greedy pool cannot fit
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docs: record the spilling hash join's second round
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perf: hand a spilled bucket's inner join one build batch
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docs: record the one-batch build and the TPC-H check
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docs: record the TPC-DS check, ineligible joins and spill codecs
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docs: point the read-back finding at the upstream fix
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feat: let a hash join spill when nothing uses the order Spark reports
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Commits on Oct 17, 2026
docs: record the TPC-H scale factor 100 run of the spilling hash join
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docs: record the TPC-DS scale factor 100 run and a fair-spill pool prototype
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docs: link the fair pool issue and DataFusion's q72 hash join issue
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feat: switch a spilling inner hash join to a sort-merge join when probe rows match many build rows
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feat: sort a switching join's build batch by its row order instead of with a SortExec
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Merge remote-tracking branch 'apache/main' into spilling-hash-join-research
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docs: point the spilling hash join design at the join planning module
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