Single-rank Exodus files loaded with IOSS reader that follow <name>.<num ranks>.<rank id> are not loaded.

Description

Single-rank files that follow the format <name>.<num ranks>.<rank id> are not read by ParaView. If you remove the portion .<num ranks>.<rank id> from the file name, the data loads just fine.

Original discussion: https://discourse.paraview.org/t/unable-to-visualize-exodus-file-from-sculpt/15121

Steps to reproduce

• Download the file sculpt_overlay.e.1.0.
• Launch ParaView 5.13.0-RC1, built in server
• File -> Open.... Select sculpt_overlay.e.1.0.
• You will get the error message:

ERROR: In vtkIOSSReaderInternal.cxx, line 310
vtkIOSSReader (0x7f88e7f79140): Error in UpdateTimeInformation: 
Failed to open database /Users/cory.local/Desktop/sculpt_overlay.e

ERROR: In vtkExecutive.cxx, line 730
vtkPVCompositeDataPipeline (0x600001fd0800): Algorithm vtkIOSSReader (0x7f88e7f79140) returned failure for request: vtkInformation (0x60000c620480)
  Debug: Off
  Modified Time: 372791
  Reference Count: 1
  Registered Events: (none)
  Request: REQUEST_INFORMATION
  ALGORITHM_AFTER_FORWARD: 1
  FORWARD_DIRECTION: 0

Note that it is trying to open sculpt_overlay.e instead of sculpt_overlay.e.1.0.

The issue seems to come from this line in the IOSS library:

https://www.github.com/sandialabs/seacas/blob/master/packages/seacas/libraries/ioss/src/Ioss_Utils.C#L197

The conditional checks that num processes is greater than 1, and if not, it does not add the .1.0 back to the file name.

Configuration

• Operating system and version: macOS Sonoma 14.5 on Intel chip
• ParaView executable and version: ParaView 5.13.0-RC1, GUI
• ParaView configuration: Built-in server