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Jinwoo-H
eac47053cc
PR 2 deleted `conversation_fts` on the strength of this PR's shoot-out, so the
scope is a column filter over the one FTS table now. `ftsTableFor` is gone; a
scope is a pair of `scopedExpression` and `scopedWeights`, and the table name
no longer travels through the engine, the snippet builder or a hit.
The filter is parenthesised, and that is the whole of it: `{cols}: (a AND b)`
binds both terms, while `{cols}: a AND b` binds only the first and searches
tool output for the rest. A test drives an AND whose second term lives only in
tool output through both scopes.
The snippet keeps one guard, not two. Its column list and its expression were
each hiding the other's mistakes — a tool-only row was unreachable through
either — so the list is the same four columns for every scope and the scoped
expression is what makes a conversation snippet impossible to draw out of tool
output. Dropping it now leaks that row, which a test catches.
One behaviour the deleted table did not have, pinned rather than wished away:
bm25 normalises by the whole row's length and has no per-column length, so two
rows with identical prose score differently when one also holds tool output.
The rowid set is unchanged; the order within it can move.
Re-measured on the shipping schema. The conversation scope is 1.2-1.4x faster
than `all` at every rung, and the index is 57 MB rather than about 150 MB at
93% tool output, because a tool row is now capped at 3,072 characters.