Continue moving to use name in SortingInfo #6400
Merged
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Motivation for features / changes
For the HParam work that is being done we are now using the name field as the unique identifier for columns. Therefore the SortingInfo interface needs to use name and not header. However, making the hard swap to using name would break sync so it is happening in stages. The name switch to using names happened in #6362. However, we had to make name optional for sync reasons. Googlers see cl/534097086 to see where name was added. Now this PR makes header optional. I will then make an internal change to remove it. Then I can finally submit a final PR which removes the property entirely.