Adopt minDistance for the portable Q5 cross-platform queries#40
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Q5 in the portable and th3index-portable query sets aggregates each licence group's trips into a tgeompoint array and calls minDistance(tgeompoint[], tgeompoint[]) for the exact set-set spatial minimum distance, matching the PG-native query set. The kernel uses each trip's STBox as a sound lower-bound prefilter and computes the per-pair distance with liblwgeom's segment-pair sweep, so the answer is identical to the aggregated geometry-collection form across PostgreSQL/MobilityDB, DuckDB/MobilityDuck and Spark/MobilitySpark.
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Q5 in the portable and th3index-portable query sets aggregates each licence group's trips into a tgeompoint array and calls minDistance(tgeompoint[], tgeompoint[]) for the exact set-set spatial minimum distance, matching the PG-native query set. The kernel uses each trip's STBox as a sound lower-bound prefilter and computes the per-pair distance with liblwgeom's segment-pair sweep, so the answer is identical to the aggregated geometry-collection form across PostgreSQL/MobilityDB, DuckDB/MobilityDuck and Spark/MobilitySpark.