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Update flink docs with alter column support #9756

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Update flink docs with alter column support #9756

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17 changes: 16 additions & 1 deletion docs/docs/flink-ddl.md
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Expand Up @@ -200,12 +200,27 @@ For more details, refer to the [Flink `CREATE TABLE` documentation](https://nigh

### `ALTER TABLE`

Iceberg only support altering table properties:
Table properties:

```sql
ALTER TABLE `hive_catalog`.`default`.`sample` SET ('write.format.default'='avro');
```

Since Flink 1.17 Iceberg supports column DDL:
* add column
* modify column
* drop column
* rename column
* add primary key

```sql
ALTER TABLE `hive_catalog`.`default`.`sample` ADD (col1 INTEGER);
ALTER TABLE `hive_catalog`.`default`.`sample` MODIFY (col1 BIGINT);
ALTER TABLE `hive_catalog`.`default`.`sample` DROP (col1);
ALTER TABLE `hive_catalog`.`default`.`sample` RENAME col1 TO col2;
ALTER TABLE `hive_catalog`.`default`.`sample` ADD (PRIMARY KEY (col1) NOT ENFORCED);
```

### `ALTER TABLE .. RENAME TO`

```sql
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