perf(agent-sessions): project the span read down to the keys the mapper reads - #739
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JeremyFunk wants to merge 2 commits into
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perf(agent-sessions): project the span read down to the keys the mapper reads#739JeremyFunk wants to merge 2 commits into
JeremyFunk wants to merge 2 commits into
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…er reads The session spans read selected `SpanAttributes` and `ResourceAttributes` whole, then `mapAiSpan` read a fixed list of keys off the first and nothing off the second. Measured on the largest production sessions, the resource map was ~60% of the raw bytes and one unrelated key (`db.query.text`) was half of what remained — none of it reached the wire. `spanProjection` now filters the span map to `aiSpanAttributeKeys` — every source key of every integration plus what the refine hooks read, declared next to the hook as `refineKeys` — and the prompt-variable prefix, and drops the resource map. The byte cap on the read now measures what actually ships. `mapFilterKeys` is the builder primitive: `mapFilter((k, v) -> …)` with the key predicate written in the DSL's own conditions.
This was referenced Sep 2, 2026
…ean-span-projection # Conflicts: # packages/query-engine-integrations/src/ai/ai-sessions.ts
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Why
The Agent Sessions spans read selected the whole
SpanAttributesandResourceAttributesmaps per span and then mapped a fixed set of keys server-side. On the largest sessions in the warehouse the resource map alone was ~60% of the raw response and a single unrelated key (db.query.text) was half of the rest. The mapper never read either, so the byte ceiling on the read was measuring bytes that never reached the client.What
spanProjectionprojectsSpanAttributesthroughmapFiltertoaiSpanAttributeKeys— the union of every integration's source keys, themaple_ai.*envelope, and the keys refine hooks read (now declared on the integration asrefineKeys) — plus thegen_ai.prompt.variable.*family.ResourceAttributesis no longer selected.mapFilterKeysadded to@maple-dev/clickhouse-builder:mapFilter((k, v) -> <predicate>, map)with the key predicate written in DSL conditions.Verification
clickhouse-builder,query-engine-integrations(AI + catalog/baseline) andapps/apiroute tests green.CLICKHOUSE_E2E=1SQL catalog sweep against a local ClickHouse: 253 shapes pass.🤖 Generated with Claude Code
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