Iceberg: Alter column set data type fails for the complex types

[mayankvadariya]

Following statement fails with the given error.

CREATE TABLE t_row(c_row row(f1 varchar, f2 map(varchar, varchar)));
ALTER TABLE t_row ALTER COLUMN c_row SET DATA TYPE row(f1 varchar, f2 map(varchar, varchar), f3 varchar);

io.trino.spi.TrinoException: Failed to set column type: Cannot change type from map<string, string> to map<string, string>
  at io.trino.plugin.iceberg.IcebergMetadata.setColumnType(IcebergMetadata.java:1602)
  at io.trino.plugin.base.classloader.ClassLoaderSafeConnectorMetadata.setColumnType(ClassLoaderSafeConnectorMetadata.java:335)
  at io.trino.plugin.objectstore.ObjectStoreMetadata.setColumnType(ObjectStoreMetadata.java:541)
  at io.trino.metadata.MetadataManager.setColumnType(MetadataManager.java:752)
  at io.trino.execution.SetColumnTypeTask.execute(SetColumnTypeTask.java:103)
  at io.trino.execution.SetColumnTypeTask.execute(SetColumnTypeTask.java:49)
  at io.trino.execution.DataDefinitionExecution.start(DataDefinitionExecution.java:145)
  at io.trino.execution.SqlQueryManager.createQuery(SqlQueryManager.java:249)
  at io.trino.dispatcher.LocalDispatchQuery.lambda$startExecution$7(LocalDispatchQuery.java:146)
  at io.trino.$gen.Trino_407_55_ga0203e1____20230306_143023_2.run(Unknown Source)
  at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
  at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
  at java.base/java.lang.Thread.run(Thread.java:1589)
Caused by: java.lang.IllegalArgumentException: Cannot change type from map<string, string> to map<string, string>
  at io.trino.plugin.iceberg.IcebergMetadata.buildUpdateSchema(IcebergMetadata.java:1647)
  at io.trino.plugin.iceberg.IcebergMetadata.buildUpdateSchema(IcebergMetadata.java:1622)
  at io.trino.plugin.iceberg.IcebergMetadata.setColumnType(IcebergMetadata.java:1598)
  ... 12 more

Similarly below alter table also fails.

create table t_map(c_map map(varchar, varchar));
ALTER TABLE t_map ALTER COLUMN c_map SET DATA TYPE map(varchar, varchar);

[ebyhr]

That's a known limitation. Map and array types aren't supported for now.

[ebyhr]

#16248 will support adding f3 varchar field to c_row column in the description. Let me close.