caican00 opened a new issue, #9163:
URL: https://github.com/apache/iceberg/issues/9163
### Apache Iceberg version
1.4.0
### Query engine
Spark
### Please describe the bug 🐞
Hi,
I wanted to update the datatype of map key in a iceberg table, but I got an
exception as follows:
```
org.apache.spark.SparkException: Unsupported table change: Cannot update map
keys: map<int, map<int, map<int, long>>>
at
org.apache.spark.sql.execution.datasources.v2.AlterTableExec.run(AlterTableExec.scala:40)
at
org.apache.spark.sql.execution.datasources.v2.V2CommandExec.result$lzycompute(V2CommandExec.scala:40)
at
org.apache.spark.sql.execution.datasources.v2.V2CommandExec.result(V2CommandExec.scala:40)
at
org.apache.spark.sql.execution.datasources.v2.V2CommandExec.executeCollect(V2CommandExec.scala:46)
at org.apache.spark.sql.Dataset.$anonfun$logicalPlan$1(Dataset.scala:228)
at org.apache.spark.sql.Dataset.$anonfun$withAction$1(Dataset.scala:3694)
at
org.apache.spark.sql.execution.SQLExecution$.$anonfun$withNewExecutionId$5(SQLExecution.scala:105)
at
org.apache.spark.sql.execution.SQLExecution$.withSQLConfPropagated(SQLExecution.scala:165)
at
org.apache.spark.sql.execution.SQLExecution$.$anonfun$withNewExecutionId$1(SQLExecution.scala:90)
at org.apache.spark.sql.SparkSession.withActive(SparkSession.scala:774)
at
org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:64)
at org.apache.spark.sql.Dataset.withAction(Dataset.scala:3692)
at org.apache.spark.sql.Dataset.<init>(Dataset.scala:228)
at org.apache.spark.sql.Dataset$.$anonfun$ofRows$2(Dataset.scala:99)
at org.apache.spark.sql.SparkSession.withActive(SparkSession.scala:774)
at org.apache.spark.sql.Dataset$.ofRows(Dataset.scala:96)
at org.apache.spark.sql.SparkSession.$anonfun$sql$1(SparkSession.scala:617)
at org.apache.spark.sql.SparkSession.withActive(SparkSession.scala:774)
at org.apache.spark.sql.SparkSession.sql(SparkSession.scala:612)
... 47 elided
Caused by: java.lang.IllegalArgumentException: Cannot update map keys:
map<int, map<int, map<int, long>>>
at org.apache.iceberg.SchemaUpdate$ApplyChanges.map(SchemaUpdate.java:697)
at org.apache.iceberg.SchemaUpdate$ApplyChanges.map(SchemaUpdate.java:561)
at org.apache.iceberg.types.TypeUtil.visit(TypeUtil.java:512)
at org.apache.iceberg.types.TypeUtil.visit(TypeUtil.java:469)
at org.apache.iceberg.types.TypeUtil.visit(TypeUtil.java:457)
at org.apache.iceberg.SchemaUpdate.applyChanges(SchemaUpdate.java:539)
at org.apache.iceberg.SchemaUpdate.apply(SchemaUpdate.java:441)
at org.apache.iceberg.SchemaUpdate.commit(SchemaUpdate.java:448)
at
org.apache.iceberg.spark.SparkCatalog.commitChanges(SparkCatalog.java:540)
at org.apache.iceberg.spark.SparkCatalog.alterTable(SparkCatalog.java:263)
at org.apache.iceberg.spark.SparkCatalog.alterTable(SparkCatalog.java:99)
at
org.apache.spark.sql.execution.datasources.v2.AlterTableExec.run(AlterTableExec.scala:37)
... 65 more
```
But, why prohibit updating the datatype of map key in iceberg?
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