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Target customers: MaxCompute customers who want to change a table schema in MaxCompute due to business changes, especially those who need to frequently add fields to and delete fields from a table and have requirements on the sequence of fields in the table. Features released: MaxCompute allows you to change the schema of a table. You can add fields of the STRUCT data type to a table, delete fields from a table, and change the sequence of fields in a table. These features are suitable for scenarios in which the data computing logic or storage content is changed due to business changes. These features are in invitational preview. If you want to use these features, submit a ticket to apply for a trial.