advancedxy commented on code in PR #11842:
URL: https://github.com/apache/iceberg/pull/11842#discussion_r1896278567


##########
core/src/main/java/org/apache/iceberg/SchemaUpdate.java:
##########
@@ -533,6 +534,25 @@ private static Schema applyChanges(
       }
     }
 
+    if (base != null) {
+      for (int fieldIdToDelete : deletes) {
+        base.specsById()
+            .forEach(
+                (specId, spec) -> {
+                  // Prevent dropping fields that are referenced in older 
partitions specs in use.
+                  if (!specId.equals(base.defaultSpecId())) {

Review Comment:
   > This makes sense. My concern is that this is a big behavior change. Users 
cannot drop partition columns at all.
   
   I don't users can drop partition source field/columns(please note , not the 
partition columns) in current spec. See the following test:
   ```java
       TestTables.TestTable table =
           TestTables.create(tableDir, "test", SCHEMA, BY_DATA_SPEC, 
V1_FORMAT_VERSION);
       table.updateSchema().deleteColumn("data").commit();
   ```
   
   will throws:
   ```
   Cannot find source column for partition field: 1000: data: identity(2)
   org.apache.iceberg.exceptions.ValidationException: Cannot find source column 
for partition field: 1000: data: identity(2)
        at 
org.apache.iceberg.exceptions.ValidationException.check(ValidationException.java:49)
        at 
org.apache.iceberg.PartitionSpec.checkCompatibility(PartitionSpec.java:636)
        at 
org.apache.iceberg.TableMetadata$Builder.build(TableMetadata.java:1469)
        at org.apache.iceberg.TableMetadata.updateSchema(TableMetadata.java:560)
        at org.apache.iceberg.SchemaUpdate.commit(SchemaUpdate.java:447)
        at 
org.apache.iceberg.TestPartitioning.testDropPartitionSourceField(TestPartitioning.java:94)
        at 
java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        at 
org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:766)
        at 
org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
        at 
org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
        at 
org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:156)
        at 
org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:147)
        at 
org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:86)
        at 
org.junit.jupiter.engine.execution.InterceptingExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(InterceptingExecutableInvoker.java:103)
        at 
org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.lambda$invoke$0(InterceptingExecutableInvoker.java:93)
        at 
org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
        at 
org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
        at 
org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
        at 
org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
        at 
org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:92)
        at 
org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:86)
        at 
org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$8(TestMethodTestDescriptor.java:217)
        at 
org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at 
org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:213)
        at 
org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:138)
        at 
org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:68)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:156)
        at 
org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:146)
        at 
org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:144)
        at 
org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:143)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:100)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
        at 
org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:160)
        at 
org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:146)
        at 
org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:144)
        at 
org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:143)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:100)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
        at 
org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:160)
        at 
org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:146)
        at 
org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:144)
        at 
org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:143)
        at 
org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:100)
        at 
org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:35)
        at 
org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
        at 
org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:54)
        at 
org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:107)
        at 
org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
        at 
org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
        at 
org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
        at 
org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
        at 
org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:114)
        at 
org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:86)
        at 
org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute(DefaultLauncherSession.java:86)
        at 
org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.processAllTestClasses(JUnitPlatformTestClassProcessor.java:124)
        at 
org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.access$000(JUnitPlatformTestClassProcessor.java:99)
        at 
org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop(JUnitPlatformTestClassProcessor.java:94)
        at 
org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:63)
        at 
java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        at 
org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
        at 
org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
        at 
org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
        at 
org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:92)
        at jdk.proxy1/jdk.proxy1.$Proxy4.stop(Unknown Source)
        at 
org.gradle.api.internal.tasks.testing.worker.TestWorker$3.run(TestWorker.java:200)
        at 
org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:132)
        at 
org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:103)
        at 
org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:63)
        at 
org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
        at 
org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:121)
        at 
org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:71)
        at 
worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
        at 
worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)
   ```
   
   So, it make sense to not allow dropping partition source columns in other 
active partition specs as well. The only problem is that the void transform in 
V1 table, which still references a source column.



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