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`WeightedFrequency::estimate` reads one identity tuple's point estimate (min over rows for CMS, sign-corrected median for CountSketch), with the same identity normalization as `update`. Capacity 0 builds a frequency sketch that retains no candidates, so a plain CountSketch or Count-Min can use the kernel's per-row seeding without carrying a heap.
This was referenced Oct 15, 2026
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Why
ASAPPlanner's executor moves its plain CountSketch onto the per-row-seeded
WeightedFrequencykernel, so that each row hashes independently and the planner's binomial-tail failure probability holds at any depth. That kernel has no public point estimate and no heap-less mode yet.What
WeightedFrequency.How
A small API addition on top of the weighted frequency kernels (#160). This PR is stacked on #160's branch.
Before this PR
Callers could read estimates only through the heap path, and a heap was always allocated.
After this PR
A caller can build a heap-less sketch and query any key's estimate.
Verification
See the commit's tests. ASAPPlanner's planner pin branch
planner-pin/univmon-certifiable-weighted-frequency-estimate(9415c5b) uses this commit, and its executor tests pass there (ASAPPlanner PR #706).Limitations
Stacked on #160; retarget to main after #160 merges.