bench(parquet): cover mask-backed intersection/union in row_selector - #10574
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alamb merged 2 commits intoAug 7, 2026
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The existing `intersection`/`union` benchmarks build their operands with `from_filters`, which is selector-backed, so they take the `RowSelector` merge path and never reach the bitwise one. Add `mask_intersection`/`mask_union` alongside them, varying two dimensions that drive the bitwise path: the ratio between operand lengths, since the longer side's tail passes through unchanged, and the bit offsets the operands carry, since masks come from `BooleanBuffer::slice` and whether the two share a sub-64-bit alignment decides which path the underlying helpers take.
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Which issue does this PR close?
Split out of #10446 so that CI can compare both sides — the benchmark is new there, so the merge-base has nothing to compare against and the
maincolumn comes out empty.Rationale for this change
row_selector.rsalready benchmarksintersection/union, but it builds the operands withfrom_filters, which is selector-backed. Those take theRowSelectormerge path and never reach the bitwise one used when both operands are mask-backed.What changes are included in this PR?
Adds
mask_intersection/mask_union, varying the two dimensions that drive the bitwise path:BooleanBuffer::sliceand whether the two share a sub-64-bit alignment decides which path the underlying helpers takeBenchmark only, no library changes.
Are these changes tested?
N/A — this is a benchmark. It builds and runs on
mainas-is.Are there any user-facing changes?
No.