rdblue commented on pull request #2496:
URL: https://github.com/apache/iceberg/pull/2496#issuecomment-1038403141
> Are complex types allowed to have defaults? Just wondering how complicated
this can get
I don't think that maps or lists can have default map values or list
elements. May entire map or list can be defaulted? It would be easier if you
could assume an empty map or empty list default. We could allow empty defaults
with a simple flag, or we could allow expressing defaults like `map("a" => 1)`
or `list(1, 2, 3)`. I'm not sure if the custom defaults are worth the
complexity.
We have a similar choice for structs. A struct could be defaulted using a
flag and nested default values, so the struct is non-null and all its columns
have default values. Or we could allow setting a specific default struct. I'm
again not sure about the utility of the specific default struct. It is way more
complicated for us to store the default values.
The choice here may come down to the strategy used to store default values.
If we use simple JSON structures, then we can definitely store the nested
defaults. I'm interested to hear a proposal for this.
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