setshape() should not touch the joined dim #1656
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Do you have a specific use case in mind for this? If there is no specific use case, should we maybe rather just check this and throw an error if the shape is changed in unconventional ways? Also, I think that this logic is more adequately placed in the frontend at |
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| var.SetShape(shape); |
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I don't think that the previous shape should be considered here at all.
This code is executed when the Variable was already part of the previous step. The Variable shape can be something completely new in the new step. If the user means to use a joined dimension again, Dataset::JOINED_DIMENSION should be specified again; we should not try to outsmart the user by trying to keep the joined dimension from the previous step.
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| dims.push_back(ext); | ||
| auto idx = joined_dim.value(); | ||
| dims[idx] = var.Shape()[idx]; |
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Undefined behavior if the vector lengths are not the same
Yes, this change was needed when testing joined dimension in warpx. Let me see if I can come up with a test case. |
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This has been fixed with #1740, I think? Feel free to reopen, if not. |
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if a joined dim exists, setshape() should not change it.