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* [AI] make ReadOnlyRoaringFlags bitmap and bool index counts lazy
Opening a read-only segment scanned every flags file end to end:
`ReadOnlyRoaringFlags::open` materialized the whole RoaringBitmap via
`iter_ones()`. Every payload field carries a null index, so this was paid
per field per segment, for bitmaps most queries never touch.
Make the bitmap a `OnceLock`, filled by a scan on first access. Open now
reads only the tiny status file. `ReadOnlyBoolIndex`'s three eager count
fields collapse into one lazily-derived, cached `BoolCounts`; its
`live_reload` refreshes them in place when present and leaves them unset
otherwise, so reloading an index nothing queries stays scan-free.
Propagate the resulting `OperationResult` through `RoaringFlagsRead`,
`PayloadFieldIndexRead::count_indexed_points`, `FieldIndexRead`,
`PayloadIndexRead::{indexed_points, get_telemetry_data}`, `build_info` /
`build_telemetry` and `SegmentEntry::{info, get_telemetry_data}`, out
into shard, edge and collection.
`ram_usage_bytes` stays infallible: an unmaterialized bitmap holds no
RAM, so it reports 0 via the new `bitmap_if_materialized`.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
* [AI] correct `preopen` comment: `open` no longer scans the flags file
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
* [AI] fix edge examples for fallible `info()`
`EdgeShardRead::info` now returns `OperationResult<ShardInfo>`. The
examples live in their own workspace (lib/edge/publish), so the main
`cargo check --workspace` never saw them.
Every call site sits in `fn main() -> Result<(), Box<dyn Error>>`, so
propagate with `?`. `bm25-search` compiled either way but would have
printed the `Result` rather than the `ShardInfo`.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>