[GitHub] [iceberg] wmoustafa commented on a change in pull request #4301: Docs: Default value support feature specification

[GitBox <gi...@apache.org>]

wmoustafa commented on a change in pull request #4301:
URL: https://github.com/apache/iceberg/pull/4301#discussion_r823194709



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File path: format/spec.md
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@@ -158,7 +158,7 @@ For the representations of these types in Avro, ORC, and Parquet file formats, s
 
 #### Nested Types
 
-A **`struct`** is a tuple of typed values. Each field in the tuple is named and has an integer id that is unique in the table schema. Each field can be either optional or required, meaning that values can (or cannot) be null. Fields may be any type. Fields may have an optional comment or doc string.
+A **`struct`** is a tuple of typed values. Each field in the tuple is named and has an integer id that is unique in the table schema. Each field can be either optional or required, meaning that values can (or cannot) be null. Fields may be any type. Fields may have an optional comment or doc string. Fields can also have a default value (see below).

Review comment:
       This sounds like the `INSERT INTO` use case in [this comment](https://github.com/apache/iceberg/pull/2496#issuecomment-1048352760). The support should come from the engine first. Regardless, yes, we cannot support that today.




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