arrow-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Ishan Anand <>
Subject [C-Glib] - writing an extension array
Date Thu, 26 Nov 2020 18:11:53 GMT

How do you go about implementing an extension type through the C API for Arrow?

Creating a record batch in python like the example in pyarrow tests [here](,
and reading the resulting schema using the C API, it correctly reads it as an array of the
underlying storage type. The schema along with the metadata can be printed as expected.
ext: int64
-- metadata --
ARROW:extension:metadata: freq=D
ARROW:extension:name: test.period

However, trying to access the metadata for the schema (obtained with `garrow_schema_get_metadata`)
indicates its size to be 0, which indicates that metadata for the schema isn't the same as
that for a field. Is it possible using the existing API to read/write the metadata for a field?

Thank you,

View raw message