Method threw 'java.lang.NullPointerException' exception. Cannot evaluate org.apache.calcite.rel.AbstractRelNode$InnerRelDigest.toString()

这个错误信息是在Java中出现的。这个错误通常表示代码中出现了一个空指针异常，也就是说某个对象为null，而代码尝试对它进行操作，导致了异常的抛出。

根据错误信息，我猜测是在进行InnerRelDigest对象的toString()方法调用时出现了空指针异常，可能是因为digest对象未被正确初始化或者被赋值为null了。建议你查看代码中对digest对象的初始化和使用，找出具体的问题所在并进行修复。

相关问题

Method threw java.lang.reflect.UndeclaredThrowableException exception. Cannot evaluate com.sun.proxy.$Proxy55.toString()

This error message suggests that an exception was thrown while trying to execute the `toString()` method on an object of type `com.sun.proxy.$Proxy55`. The root cause of the exception is not clear from this message, but it may be due to a variety of reasons such as an invalid argument, null pointer, or an exception thrown by the underlying method being invoked. To resolve this issue, you may need to examine the code that is calling this method and identify the source of the problem.

method threw 'java.lang.illegalstateexception' exception. cannot evaluate org.apache.hadoop.mapreduce.job.tostring()

这个错误是由于在尝试调用org.apache.hadoop.mapreduce.job.toString()方法时抛出了java.lang.illegalstateexception异常。可能是由于作业对象的状态不正确或作业对象已被关闭导致的。需要检查作业对象的状态并确保它处于正确的状态。