How do I remove attribute columns from a data table?

Data tables are schema-free. Each row of data may have different attribute columns. You cannot remove a specific attribute column from all rows in a data table at the same time.

After you obtain the primary key information of a row, you can call the UpdateRow operation to remove an attribute column of the row. In this example, Tablestore SDK for Java is used to remove the Col attribute column from a row.

private static void updateRow(SyncClient client, String pkValue) {
    // Construct the primary key. 
    PrimaryKeyBuilder primaryKeyBuilder = PrimaryKeyBuilder.createPrimaryKeyBuilder();
    primaryKeyBuilder.addPrimaryKeyColumn("<PRIMARY_KEY_NAME>", PrimaryKeyValue.fromString(pkValue));
    PrimaryKey primaryKey = primaryKeyBuilder.build();
    
    // Specify the name of the data table. 
    RowUpdateChange rowUpdateChange = new RowUpdateChange("<TABLE_NAME>", primaryKey);

    // Remove all versions of data from the attribute column. 
    rowUpdateChange.deleteColumns("Col");
    // Remove a specific version of data from the attribute column. 
    //rowUpdateChange.deleteColumn("Col", 1465373223000L);

    client.updateRow(new UpdateRowRequest(rowUpdateChange));
}  

To remove an attribute column from multiple rows of data at the same time, call the BatchWriteRow operation.