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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