Geospatial functions

Function	Support	Notes
`H3_CELL_TO_BOUNDARY`, `H3_CELL_TO_CHILDREN`, `H3_CELL_TO_CHILDREN_STRING`, `H3_CELL_TO_CHILDREN_STRINGS`, `H3_CELL_TO_POINT`, `H3_COMPACT_CELLS`, `H3_COMPACT_CELLS_STRINGS`, `H3_COVERAGE`, `H3_COVERAGE_STRINGS`, `H3_GET_RESOLUTION`, `H3_GRID_DISK`, `H3_GRID_DISTANCE`, `H3_GRID_PATH`, `H3_INT_TO_STRING`, `H3_IS_PENTAGON`, `H3_IS_VALID_CELL`, `H3_LATLNG_TO_CELL`, `H3_LATLNG_TO_CELL_STRING`, `H3_POINT_TO_CELL`, `H3_POINT_TO_CELL_STRING`, `H3_STRING_TO_INT`, `H3_TRY_COVERAGE`, `H3_TRY_COVERAGE_STRINGS`, `H3_TRY_GRID_DISTANCE`, `H3_TRY_GRID_PATH`, `H3_TRY_POLYGON_TO_CELLS`, `H3_TRY_POLYGON_TO_CELLS_STRINGS`, `H3_UNCOMPACT_CELLS`, `H3_UNCOMPACT_CELLS_STRINGS`, `HAVERSINE`, `ST_AREA`, `ST_ASBINARY`, `ST_ASEWKB`, `ST_ASEWKT`, `ST_ASGEOJSON`, `ST_ASTEXT`, `ST_ASWKB`, `ST_ASWKT`, `ST_AZIMUTH`, `ST_BUFFER`, `ST_CENTROID`, `ST_COLLECT`, `ST_CONTAINS`, `ST_COVEREDBY`, `ST_COVERS`, `ST_DIFFERENCE`, `ST_DIMENSION`, `ST_DISJOINT`, `ST_DISTANCE`, `ST_DWITHIN`, `ST_ENVELOPE`, `ST_GEOHASH`, `ST_GEOMPOINT`, `ST_HAUSDORFFDISTANCE`, `ST_INTERSECTION`, `ST_INTERSECTION_AGG`, `ST_INTERSECTS`, `ST_ISREPAIRED`, `ST_ISVALID`, `ST_LENGTH`, `ST_MAKEGEOMPOINT`, `ST_MAKELINE`, `ST_MAKEPOINT`, `ST_NPOINTS`, `ST_NUMPOINTS`, `ST_PERIMETER`, `ST_POINT`, `ST_SETSRID`, `ST_SIMPLIFY`, `ST_SRID`, `ST_SYMDIFFERENCE`, `ST_UNION`, `ST_UNION_AGG`, `ST_WITHIN`, `ST_X`, `ST_XMAX`, `ST_XMIN`, `ST_Y`, `ST_YMAX`, `ST_YMIN`	Not supported