uber / uber/h3-java

Compact Cells Failing on Certain Large Polygons

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Description

We have observed that after version 3.7.0 that certain large polygons are failing the compactCells methods with the following error: `com.uber.h3core.exceptions.H3Exception: Resolution argument was outside of acceptable range

at com.uber.h3core.NativeMethods.compactCells(Native Method)
at com.uber.h3core.H3Core.compactCells(H3Core.java:781)`

We are using a resolution of 6 which produces the same error but has 1.5 million in the collection. Here is the collection Long we are sending to compactCells on resolution 1: [581487719465615359, 582222193232969727, 581193050349371391, 582613619372457983, 581927524116725759, 581584476488859647, 581241428860993535, 581289807372615679, 581681233512103935, 581729612023726079, 581434942907482111, 582169416674836479, 581483321419104255, 582217795186458623, 581188652302860287, 581923126070214655, 581580078442348543, 581237030814482431, 581285409326104575, 581676835465592831, 581725213977214975, 581087497233104895, 582165018628325375, 581478923372593151, 581184254256349183, 582604823279435775, 581918728023703551, 581575680395837439, 581232632767971327, 582015485046947839, 581672437419081727, 581720815930703871, 581426146814459903, 581083099186593791, 581474525326082047, 581179856209838079, 581571282349326335, 581228234721460223, 581716417884192767, 581078701140082687, 581470127279570943, 582204601046925311, 581566884302815231, 581223836674949119, 582006688953925631, 581663641326059519, 581712019837681663, 581025924581949439, 581074303093571583, 582200203000414207, 582248581512036351, 581219438628438015, 581659243279548415, 580973148023816191, 581707621791170559, 581461331186548735, 582244183465525247, 581215040581926911, 581654845233037311, 581311797605171199, 582389319000391679, 581017128488927231, 581945116302770175, 581650447186526207, 581307399558660095, 581698825698148351, 581012730442416127, 581452535093526527, 581940718256259071, 581646049140015103, 581303001512148991, 581694427651637247, 581008332395905023, 581448137047015423, 581201846442393599, 581936320209747967, 581593272581881855, 581641651093503999, 581298603465637887, 581690029605126143, 581003934349393919, 581443739000504319, 581100691372638207, 582178212767858687, 582226591279480831, 581197448395882495, 581931922163236863, 581588874535370751, 582323348302725119, 581637253046992895, 581294205419126783, 581685631558615039, 581734010070237183, 581439340953993215]

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start at H3Core.java:781 and the NativeMethods.compactCells entry point, then reproduce the failure with the provided resolution-1 collection and the reported resolution-6 case. Done means compactCells handles these large polygon inputs without raising the resolution-range H3Exception.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
api
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
28/100

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