feat(search): sort results via sortProperties / order_by - #3298
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Up to standards ✅🟢 Issues
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| Metric | Results |
|---|---|
| Complexity | 165 |
| Duplication | 48 |
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Offset pagination is emulated by fetching from+size and slicing, and the per-space fan-out multiplies that. Documented as accepted debt at both places, pointing to cursor pagination via the unused page_token fields as the designated fix.
Validated against the sortable-field whitelist (name, size, lastModifiedDateTime, photo.takenDateTime) and forwarded to the search service as order_by. Also fixes the stub search service's IndexSpace signature (streaming response) so the suite builds again.
Sortable is every field that is indexed as a scalar and carried on the match entity: name, size, lastModifiedDateTime, mimeType and the scalar facet fields (photo.*, audio.*, image.*, location.*, ...). Both sets are derived by reflection, so new facet fields become sortable automatically. Multivalued fields (tags), bare facets and internal index fields are rejected with invalidRequest at the graph layer. CompareMatches provides the merge comparator for the service layer.
The fan-out passes order_by through to each engine query; the merge re-sorts the combined matches with CompareMatches and keeps the score as tiebreaker (and as the sole criterion when no order_by is given).
Name is analyzed (lowercaseKeyword) and therefore a text field, which OpenSearch refuses to sort on without fielddata; enable it in the index template. The keyword tokenizer emits one term per document, so the fielddata cache stays small. The schema version has not shipped yet, so no reindex is needed.
The backends sort Name by its lowercased index term; the cross-space merge now compares the same way so backend order survives the merge. Case-preserved fields (audio.artist, ...) keep byte order.
The grpc layer rebuilt the searcher request field by field and dropped order_by; the response cache also ignored it, so differently sorted searches collided on the same cache entry.
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Adds MS-Graph-style
sortPropertiesto the graph search endpoint andorder_byto the search proto.invalidRequest.name).order_byis wired through the grpc service and its response cache key.Spec: opencloud-eu/libre-graph-api#61
Stacked on #3211.