rdblue commented on a change in pull request #4301:
URL: https://github.com/apache/iceberg/pull/4301#discussion_r835502912
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File path: format/spec.md
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@@ -193,6 +193,13 @@ Notes:
For details on how to serialize a schema to JSON, see Appendix C.
+#### Default value
+
+Default value can be assigned to top-level columns or nested fields when they
are added to an Iceberg table as part of the schema evolution. The first time a
default value is added, this default value is used to read rows belonging to
the files that lack the column (i.e. the files were written before the column
is added), this default value will also be the default value for the column if
user later inserts new rows without specifying the column.
Review comment:
Yeah, the spec is definitely not user-facing. It is a clear definition
of what metadata we are tracking and how it must be used in tables.
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