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fix(databases): use the spatial index for distance queries - #14199
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PostGIS cannot serve ST_Distance comparisons from a GIST index, so radius queries walked the primary key. distanceLessThan now leads with ST_DWithin on the geometry column, which the existing spatial index can serve, and keeps the strict meter comparison. Fixes #14177
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Pins utopia-php/database to the PostgreSQL distance-index fix and locks it to commit c5fc677. Extends spatial E2E coverage with degree-distance results, a geodesic linestring regression, and PostgreSQL query-plan checks scoped to the current test collection. Latest changes: Replaces broad PostgreSQL table discovery with project, database, and collection metadata lookups, including shared-table namespace and tenant handling.
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🟡 Tier B · 1 blocking finding to address. Summary
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Introduces an Appwrite Postgres adapter subclass that adds a GIST-index-servable ST_DWithin bounding prefilter to distance queries, and rebinds the Postgres adapter in DI registrations.
Key findings
- 🟠 Latitude clamp breaks superset near poles — Postgres.php:113
| $latitude = min(89.9, $maxAbsLatitude + $latitudeDelta); | ||
| $cosine = cos(deg2rad($latitude)); | ||
| if ($cosine < 0.0001) { | ||
| $cosine = 0.0001; | ||
| } | ||
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| $longitudeDelta = $meters / (self::LONGITUDE_METERS_PER_DEGREE * $cosine); | ||
| $degrees = hypot($latitudeDelta, $longitudeDelta) * self::DEGREE_MARGIN; | ||
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| if ($minLongitude - $degrees < -180.0 || $maxLongitude + $degrees > 180.0) { | ||
| return null; |
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🟠 bug · high
Latitude clamp breaks superset near poles
The clamp $latitude = min(89.9, $maxAbsLatitude + $latitudeDelta) moves the cosine input the wrong way (src/Appwrite/Database/Adapter/Postgres.php:113). Cosine shrinks toward 90°, so clamping a worst-case latitude above 89.9° down to 89.9° makes longitudeDelta (line 119) smaller than the true longitudinal span of the meter circle there — at 89.99° it is ~10x too small. A row within the geodesic meter radius can then lie outside the planar ST_DWithin bound and be silently dropped before the exact geography ST_Distance filter runs, so distanceLessThan(..., meters: true) misses matching documents. Additionally, when $maxAbsLatitude + $latitudeDelta >= 90 the meter circle encloses a pole and the matching region wraps every longitude, which no planar degree box can contain; the correct result there is the null exact-distance fallback, not a clamped box.
📋 Prompt for AI Agents
In src/Appwrite/Database/Adapter/Postgres.php, in degreesCoveringMeters() around lines 112-120: remove the min(89.9, ...) clamp and instead return null when $maxAbsLatitude + $latitudeDelta >= 90.0 (the meter circle reaches a pole, so a planar degree box cannot bound it and the parent's exact geography ST_Distance fallback must be used). Otherwise compute $latitude = $maxAbsLatitude + $latitudeDelta directly — it is then guaranteed below 90°, so cos(deg2rad($latitude)) is positive and the computed degree radius is a genuine superset of the meter radius. Without this, geodesic matches near the poles (e.g. vertex at lat 89.95 lon 0 vs a row at lat 89.95 lon 8, ~0.78 km apart) are excluded by the ST_DWithin prefilter while the parent ST_Distance predicate matches them, silently dropping rows from distanceLessThan queries.
✨ Benchmark resultsComparing
Per-scenario breakdown & investigation detailsMetrics below reflect the current branch (after). Δ P95 compares against the base.
Top API waits (after)
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A planar degree radius around a line or polygon misses geodesic edges, and clamping latitude near a pole made that radius too small. Point queries still use ST_DWithin on the geometry index. Lines, polygons, polar caps, and the antimeridian keep the exact geography comparison. Fixes #14177
A stored line or polygon can sit closer on the geodesic than on the planar segment, so a degree radius around a point query can drop those rows. Meter queries use ST_DWithin only when the column is a point too. Degree queries stay on ST_DWithin for every geometry type. Fixes #14177
…atabase The Postgres adapter in utopia-php/database now leads distanceLessThan with an index-served predicate: ST_DWithin without meters, and a degree box around point columns with meters. Drop the Appwrite subclass, whose degree radius dropped valid rows near the poles and around geodesic edges, and pin the library branch until it is released. Fixes #14177
The index predicate now comes from the pinned database package. Keep the SQL contract here so a point query still uses the geometry index, and a line or polygon on either side stays on geography distance. Fixes #14177
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@hansi-codes review |
The unit suite was locking the adapter's SQL text. Distance results stay on the existing spatial end-to-end test, including a geodesic line that a planar prefilter would drop. On PostgreSQL, EXPLAIN must use the spatial index for both meter and degree distanceLessThan. Fixes #14177
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The plan check scanned every table with loc and _uid, including parallel runs that also use document id p0. Resolve this collection from project metadata and EXPLAIN that table only. Fixes #14177
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@hansi-codes review |
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Already reviewed 9376e93. No new commits since then, so I didn't post another review. |
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What does this PR do?
Distance filters were compiled as
ST_Distance(...) < radius. PostGIS cannot serve that predicate from a GIST index, so adistanceLessThanquery walked the primary key and got slower as fewer rows matched (#14177).The predicate lives in
utopia-php/database. This PR pinsdev-fix/postgres-distance-index(c5fc67729e3cabd397e534be3bd5c7431ffbe4b7, aliased as7.4.999) until that fix is tagged. Replace the branch pin with the release when it ships.distanceLessThannow leads with an index-served predicate on the geometry column (USING GIST (column)). The original comparison stays in the statement, so results do not change: the boundary stays exclusive, and meter queries still use spheroidal distance.ST_DWithin(column, geometry, radius)is a superset ofST_Distance(...) < radiusfor points, lines, and polygons.column && ST_Expand(...)) contains the meter circle only when both sides are points: the column type ispointand the query value is a point. Longitude uses the poleward latitude, so the box stays large enough near the poles. The box is not applied when it would reach a pole or the antimeridian.distanceGreaterThan,distanceEqual, anddistanceNotEqualstay onST_Distance. Those predicates cannot use a spatial index.Test Plan
testSpatialDistanceInMeterchecks returned rows: 1500 m includes both points, 500 m only the origin, and the same split in degrees (0.02vs0.001).[-60, 60]to[60, 60]is returned by a 20 km query at[0, 74]. That point sits on the great-circle arc and outside the straight segment, so a planar prefilter would drop it.EXPLAINof the adapter's meter and degreedistanceLessThanpredicates must use the spatial index rather than the primary key. Sequential scans are disabled so a two-row table still reveals whether the predicate can use the index. The statement targets this test's collection, resolved from the project, database, and collection sequences, so a parallel run cannot delete another table out from under the plan.distanceGreaterThan,distanceEqual, anddistanceNotEqualrow results are unchanged.Related PRs and Issues
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