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Fix sparse_keys function to bypass slow keys() call unless needed #3971

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Fix sparse_keys function to bypass slow keys() call unless needed #3971

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2 changes: 2 additions & 0 deletions pyomo/core/base/indexed_component.py
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Original file line number Diff line number Diff line change
Expand Up @@ -515,6 +515,8 @@ def keys(self, sort=SortComponents.UNSORTED, ordered=NOTSET):
# IndexedComponent): we might as well just sort the sparse
# _data keys instead of iterating over the whole index.
return iter(sorted_robust(self._data))
elif SortComponents.UNSORTED in sort:
return iter(self._data)
else:
#
# Test each element of a sparse _data with an ordered
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