rdblue commented on code in PR #12211:
URL: https://github.com/apache/iceberg/pull/12211#discussion_r1954993890
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api/src/main/java/org/apache/iceberg/UpdateSchema.java:
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@@ -67,24 +70,52 @@ default UpdateSchema addColumn(String name, Type type) {
}
/**
- * Add a new top-level column.
+ * Add a new optional top-level column.
*
* <p>Because "." may be interpreted as a column path separator or may be
used in field names, it
* is not allowed in names passed to this method. To add to nested
structures or to add fields
* with names that contain ".", use {@link #addColumn(String, String, Type)}.
*
* <p>If type is a nested type, its field IDs are reassigned when added to
the existing schema.
*
+ * <p>The added column will be optional with a null default value.
+ *
* @param name name for the new column
* @param type type for the new column
* @param doc documentation string for the new column
* @return this for method chaining
* @throws IllegalArgumentException If name contains "."
*/
- UpdateSchema addColumn(String name, Type type, String doc);
+ default UpdateSchema addColumn(String name, Type type, String doc) {
Review Comment:
Yes, but I don't think it is a good idea. This API is user-facing and we
don't want users to need to understand the distinction between initial default
and write default. This API is supposed to match SQL capabilities and is higher
level.
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