iceberg读写常见报错

场景：flink sink iceberg时，使用equalityFieldColumns指定字段时，报错如下：

java.lang.IllegalArgumentException: Cannot write delete files in a v1 table
	at org.apache.iceberg.ManifestFiles.writeDeleteManifest(ManifestFiles.java:154)
	at org.apache.iceberg.SnapshotProducer.newDeleteManifestWriter(SnapshotProducer.java:365)
	at org.apache.iceberg.MergingSnapshotProducer.newDeleteFilesAsManifest(MergingSnapshotProducer.java:480)
	at org.apache.iceberg.MergingSnapshotProducer.prepareDeleteManifests(MergingSnapshotProducer.java:469)
	at org.apache.iceberg.MergingSnapshotProducer.apply(MergingSnapshotProducer.java:358)
	at org.apache.iceberg.SnapshotProducer.apply(SnapshotProducer.java:163)
	at org.apache.iceberg.SnapshotProducer.lambda$commit$2(SnapshotProducer.java:276)
	at org.apache.iceberg.util.Tasks$Builder.runTaskWithRetry(Tasks.java:404)
	at org.apache.iceberg.util.Tasks$Builder.runSingleThreaded(Tasks.java:213)
	at org.apache.iceberg.util.Tasks$Builder.run(Tasks.java:197)
	at org.apache.iceberg.util.Tasks$Builder.run(Tasks.java:189)
	at org.apache.iceberg.SnapshotProducer.commit(SnapshotProducer.java:275)
	at org.apache.iceberg.flink.sink.IcebergFilesCommitter.commitOperation(IcebergFilesCommitter.java:298)
	at org.apache.iceberg.flink.sink.IcebergFilesCommitter.commitDeltaTxn(IcebergFilesCommitter.java:285)
	at org.apache.iceberg.flink.sink.IcebergFilesCommitter.commitUpToCheckpoint(IcebergFilesCommitter.java:210)
	at org.apache.iceberg.flink.sink.IcebergFilesCommitter.initializeState(IcebergFilesCommitter.java:147)
	at org.apache.flink.streaming.api.operators.StreamOperatorStateHandler.initializeOperatorState(StreamOperatorStateHandler.java:106)
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:258)
	at org.apache.flink.streaming.runtime.tasks.OperatorChain.initializeStateAndOpenOperators(OperatorChain.java:290)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$beforeInvoke$0(StreamTask.java:473)
	at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:47)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.beforeInvoke(StreamTask.java:469)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:522)
	at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:721)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:546)
	at java.lang.Thread.run(Thread.java:748)

解决办法：
社区版本现在没有把v1打开，是因为v2还有一些功能不是特别完善。如果用户想用v2展开测试的话，需要通过java API把v1升级到v2，调用方式如下：

Table table = …
TableOperations ops = ((baseTable) table).operations();
Tablemetadata meta = ops.current();
ops.commit(meta, meta.upgradeToFormatVersion(2));