KazydubB commented on issue #1455: DRILL-6724: Convert IndexOutOfBounds exception to UserException with … URL: https://github.com/apache/drill/pull/1455#issuecomment-418324098 @paul-rogers, source of IOBE here is when allocating value vector buffers or reading records from input. Currently, every Exception (except OutOfMemoryException and UserException) will be wrapped into UserException with ErrorType INTERNAL_ERROR (and will remain being such after FragmentExecutor handling). Purpose of this improvement is to enhance error messages to provide more useful information to users, while original cause is preserved. Provided context may be useful for users as it may provide some ways of resolving the issue or to make a workaround while the issue is being investigated etc. You're right that IOBE indicates a program error so I've made changes to wrap IOBE into UserException of type INTERNAL_ERROR and not DATA_READ_ERROR (as it was before in the PR).
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