feat: JMEOS 1.3 + BerlinMOD portable SQL + binary roundtrip protocol#4
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feat: JMEOS 1.3 + BerlinMOD portable SQL + binary roundtrip protocol#4estebanzimanyi wants to merge 1 commit intoMobilityDB:mainfrom
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…uck/MobilitySpark
Extends the BerlinMOD cross-platform POC (RFC #861 portable dialect) from 6
queries to 9 (Q1–Q8 + QRT), adding the full temporal-restriction, trajectory,
and region-intersection query set.
New queries:
Q2 eIntersects(trip, region) — region intersection filter
Q7 atTime(trip, tstzspan) — period restriction (binary output via asHexWKB)
Q8 trajectory(trip) — spatial path as hex WKB geometry
QRT already existed; Q3/Q7 confirmed byte-identical cross-platform
API corrections:
- Remove atPeriod alias (old pre-1.0 name); Q7 uses atTime(trip, tstzspan)
- atTime UDF is now a unified (String, String) dispatcher:
"[…]" prefix → tstzspan_in + temporal_at_tstzspan (Q7 period path)
otherwise → pg_timestamptz_in + temporal_at_timestamptz (Q3 instant path,
Spark implicitly casts TIMESTAMP column → STRING)
- trajectory UDF returns geo_as_hexewkb (not geo_as_ewkt) so the geometry
binary matches PostgreSQL COPY and DuckDB COPY output byte-for-byte
New UDFs (TemporalUDFs):
startTimestamp, endTimestamp, numInstants, speed, atGeometry
New UDFs (GeoUDFs):
eContains, trajectory (hex-WKB)
New data files:
berlinmod/data/query_regions.csv — polygon region for Q2
berlinmod/data/query_periods.csv — tstzspan period for Q7
New runner:
berlinmod/run_mspark.sh — three-runner story complete
All 9 queries verified ALL PASS on MobilityDB (run_mbdb.sh).
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Summary
atTime,eIntersects,nearestApproachDistance,eDwithin,tgeompoint(WKT→hex-WKB),geomFromText.sqlfiles run unchanged on MobilityDB (PostgreSQL), MobilityDuck (DuckDB), and MobilitySpark (Apache Spark)ashexewkb(val)UDF serialises temporal values to MEOS hex-WKB — the same C function (temporal_as_hexwkb, variant 0, NDR) called by MobilityDB/MobilityDuck. Text in (WKT CSV), binary out (hex-WKB), byte-level equality tested across all three platformsashexewkb(atTime(trip, instant))produces identical bytes on all three platformsexpected/qrt.csvgenerated from MobilityDB as ground truth; byte equality confirmedberlinmod/: dataset CSV files,expected/for Q1/Q3/Q4/Q5/Q6/QRT,run_mbdb.sh(MobilityDB, locally verified 6/6 PASS),run_mduck.sh(MobilityDuck runner)libmeos.sofrom JMEOS jar, setLD_LIBRARY_PATH; 15 unit tests passgeo_from_text()Byte-equality claim
The key correctness property: JMEOS calls
temporal_as_hexwkb(ptr, 0)(MEOS C function); MobilityDB SQL callsashexewkb(tgeompoint)(same C function). TheasHexEWKB_matches_mbdb_expectedunit test asserts byte-for-byte equality against the known MobilityDB output for trip 1.Test plan
asHexEWKBtests)run_mbdb.sh: Q1/Q3/Q4/Q5/Q6 + QRT — 6/6 PASS againstexpected/on MobilityDB locallyrun_mduck.sh: Q1/Q3/Q4/Q5/Q6 + QRT — needs MobilityDuck CLI to verifyspark-submit BerlinMODDemo berlinmod/data berlinmod/expected— needs Spark environment🤖 Generated with Claude Code