tobixdev commented on issue #21626:
URL: https://github.com/apache/datafusion/issues/21626#issuecomment-4257808635
That's great! I've also been looking into this issue a bit more and one of
the issues I've discovered is that even after adjusting
`SqlToRel::convert_simple_data_type`, the metadata seems to get lost somewhere.
I haven't had time looking at whether it's at the writing or reading end (maybe
it's also my test).
Here is the slt file that I've used:
```text
#######
# Setup test data table
#######
statement ok
CREATE TABLE test_uuid (
value UUID
) AS VALUES
(NULL);
#######
# Tests
#######
query TTT
DESCRIBE test_uuid;
----
value FixedSizeBinary(16) YES
# Remark: Here I would have expected an entry in `ARROW:extension:name`.
query ?
SELECT ARROW_METADATA(value) FROM test_uuid;
----
{}
#######
# Clean-up
#######
statement ok
DROP TABLE test_uuid;
```
If you've got any further questions don't hesitate to ask.
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