[gdal-dev] writing arrow geometry

[Michael Sumner]

When I investigate the schema in one of the test files

ogr/data/arrow/from_paleolimbot_geoarrow/polygon-default.ipc

I see expected  list<polygons and list<rings and xy etc. I'm printing this
by using R nanoarrow::read_arrow, or from poLayer->GetArrowStream and I get
the same output:

<nanoarrow_array_stream struct<row_num: int32, geometry:
geoarrow.polygon{list<rings: list<vertices:
geoarrow.point{fixed_size_list(2)<xy: double>}>>}>>

If I write a new .arrow with GDAL

ogr2ogr ~/fromgdal.arrow
ogr/data/arrow/from_paleolimbot_geoarrow/polygon-default.ipc

the stream schema looks like this:

<nanoarrow_array_stream struct<row_num: int32, geometry:
geoarrow.polygon{list<item: list<item: struct<x: double, y: double>>>}>>

and from nanoarrow I see

nanoarrow::read_nanoarrow("~/fromgdal.arrow")
Error in read_nanoarrow.character("~/fromgdal.arrow") :
  array_stream->get_schema(): [29] Expected >= 1330795077 bytes of
remaining data but found 2266 bytes in buffer

Are we in-between moves regarding specifications, or something?  I'm having
good results generally and this seems like a problem in the Arrow driver
for write.

Cheers, Mike


-- 
Michael Sumner
Research Software Engineer
Australian Antarctic Division
Hobart, Australia
e-mail: mdsumner at gmail.com
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