Add static-geometry to h3indexset prefilter UDFs#131
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H3INDEXSET is a Set<H3INDEX> blob built from a static geometry at a given H3 resolution. Two new UDFs: - geoToH3IndexSet(GEOMETRY, INTEGER) returns H3INDEXSET — covers POINT, LINESTRING, POLYGON, MULTI*, and GeomCollection input. Caller passes geometry in EPSG:4326 (e.g. ST_Transform). - everIntersectsH3IndexSet_Th3Index(H3INDEXSET, TH3INDEX) returns BOOLEAN — true when the trajectory ever passes through any cell of the static set. These accelerate the trip x static cross-join queries (BerlinMOD Q4, Q7, Q11, Q12, Q15, Q17 on the bench). Q7-style intersection on BerlinMOD sf 0.005: 0.517 s without prefilter, 0.076 s with the prefilter (6.8x).
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Summary
Adds the two MobilityDuck UDFs that complete the h3 prefilter surface for trip × static-geometry cross-join queries (BerlinMOD Q4, Q7, Q11, Q12, Q15, Q17):
`H3INDEXSET` is a new logical type (alias on `BLOB`), storing a serialized MEOS `Set`.
Stacks on PR #129 (the th3index core).
Validation
BerlinMOD scalefactor 0.005 on a single-node DuckDB build, Q7-style intersection (every trip × every QueryPoint):
Test plan