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docs(spec): aggregation and window functions on the streaming engine (#547) - #640
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…547) Settled 2026-10-20: SQL peers for window ties with one total value order, exact sums shared by both engines, index-order tricks deferred to #306, PRS-082 for a window reading a non-grouping variable. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PtCdzbJMSS1V8qEPaJ4jXz
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This was referenced Oct 20, 2026
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Design for #547 (part 5 of 9 of #473). Docs only.
Decisions settled 2026-10-20:
rankis equal for peers,row-numberbreaks ties by the other:find-named variables. One total value order for sorting, peers,rankand windowmin/max.PRS-082.Breaking answer changes for v3.0.0 are listed in §3.4. Delivery: three PRs (rules on the executor,
Aggregateon the engine,Windowon the engine).Reviewed with Codex; its findings (float special cases, deferred errors, peer vs group equality, tie-break variables in aggregate queries, PRS-082 wording) are addressed.
Part of #473 (no closing keyword).
🤖 Generated with Claude Code
https://claude.ai/code/session_01PtCdzbJMSS1V8qEPaJ4jXz