qingwei727 opened a new pull request, #7659:
URL: https://github.com/apache/paimon/pull/7659
### Purpose
Fix IllegalArgumentException: Field xxx can not be found in table schema
when dropping a column that has field-level options (e.g.
fields.xxx.default-value).
SchemaManager.generateTableSchema() removes the column from the field list
but leaves its fields.<column>.* entries in options, causing
SchemaValidation.validateFieldsPrefix() to fail. This fix removes those
orphaned options during DropColumn processing.
### Tests
SchemaManagerTest#testDropColumnCleansUpFieldOptions — creates a table with
fields.extra_col.default-value, drops the column, and verifies both the
column and its options are removed.
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