public static Set<SchemaChangeType> extractSchemaChangeType(AlterColumn alterColumn, Set<SchemaChangeType> types) {
        if (types == null) {
            types = new HashSet<>();
        }
        switch (alterColumn.getAlterType()) {
            case ADD_COLUMN:
                types.add(SchemaChangeType.ADD_COLUMN);
                break;
            case DROP_COLUMN:
                types.add(SchemaChangeType.DROP_COLUMN);
                break;
            case RENAME_COLUMN:
                types.add(SchemaChangeType.RENAME_COLUMN);
                break;
            case CHANGE_COLUMN:
                parseTypeOfChangeColumn(alterColumn, types);
                break;
            default:
        }
        return types;
    }
Extract the schema change types from {@link AlterColumn}

@param alterColumn The alterColumn
@param types The types
@return Set of {@link SchemaChangeType}
inlong-sort/sort-common/src/main/java/org/apache/inlong/sort/util/SchemaChangeUtils.java