Chris,
That change allows empty groups when reading, not when writing. For
reading, it allows you to do operations like count without projecting any
data columns but there's no corresponding use for writing.
Optional fields are a different feature, which should work just fine. How
are you getting an empty group from an optional field? Avro's pattern for
optional is a union with null, so you should have something like this:
```json
{
"name" : "some_field",
"type" : [ "null", "string" ],
"default" : null
}
```
What is the schema you're trying to write?
rb
On Mon, May 23, 2016 at 8:32 PM, christopher palm <[email protected]> wrote:
> Hi All,
> I see that Parquet-363 made some changes to allow empty schema groups,
> however I am testing with this patch and still get the error below on an
> optional field.
> Cannot write a schema with an empty group: optional group
>
> Is this fix supposed to allow a parquet file to be created when the Avro
> schema has optional fields?
>
> Thanks,
>
> Chris
>
--
Ryan Blue
Software Engineer
Netflix
