zhangbutao opened a new pull request, #7593:
URL: https://github.com/apache/iceberg/pull/7593
1. create a new empty iceberg table using Spark3.3
`create table testicespark(id int) using iceberg;`
2. create a brancn on the empty table:
`alter table hivedblake.testicespark create branch "branch1";`
3. NullPointerException
```
ERROR SparkSQLDriver: Failed in [alter table testicespark create branch
testbranch]
java.lang.NullPointerException
at
org.apache.spark.sql.execution.datasources.v2.CreateOrReplaceBranchExec.$anonfun$run$1(CreateOrReplaceBranchExec.scala:44)
at
scala.runtime.java8.JFunction0$mcJ$sp.apply(JFunction0$mcJ$sp.java:23)
at scala.Option.getOrElse(Option.scala:189)
at
org.apache.spark.sql.execution.datasources.v2.CreateOrReplaceBranchExec.run(CreateOrReplaceBranchExec.scala:44)
at
org.apache.spark.sql.execution.datasources.v2.V2CommandExec.result$lzycompute(V2CommandExec.scala:43)
at
org.apache.spark.sql.execution.datasources.v2.V2CommandExec.result(V2CommandExec.scala:43)
at
org.apache.spark.sql.execution.datasources.v2.V2CommandExec.executeCollect(V2CommandExec.scala:49)
....
```
I think we should throw a friendly exception if table is empty instead of
null exception when creating branch.
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