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feat(incremental): a backend over a source that reports its changes (improvise-rnak)

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Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze
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Claude (dbsp-sources)
2026-10-10 18:12:04 -07:00
committed by Edward Langley
parent 315e271905
commit 9d675c9c33
13 changed files with 571 additions and 24 deletions
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context/code/source.md
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@@ -87,3 +87,12 @@ implementation, written as a query engine with no index would answer, sharing on
`DataStore`. `the_store_and_a_scanned_table_answer_every_select_alike` asks both every select over a
fixture (every subset of every stored key as a base, with no span, one span of each of six item
lists, and two), at both widths and for all five functions: over 5,000 triples.
## `ChangeSource`
`CellSource` plus `drain_changes(&self) -> Vec<CellChange>`: a source that reports what changed in it.
The contract that matters is that a source's cells are those as of the last drain, so a snapshot read
now plus the changes drained later counts no change twice or not at all. Why, and how `Incremental`
uses it: `context/code/improvise-incremental.md`, step 7. `DataStore` is not a `ChangeSource`: its log
is `&mut` and is drained by the owner in the step that made the edit. A `SharedFeed` is the `Arc` a
backend and a model share.