Blizzara opened a new pull request, #10622:
URL: https://github.com/apache/datafusion/pull/10622

   ## Which issue does this PR close?
   
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   Closes #.
   
   Extracted part of https://github.com/apache/datafusion/pull/10531 - not 
necessary part for it but somewhat related
   
   Has some overlap with https://github.com/apache/datafusion/pull/10615, as 
both deal with container types - once one is merged, I'll update the other to 
resolve conflicts.
   
   ## Rationale for this change
   
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   ## What changes are included in this PR?
   
   Adds support for converting from un-named DataFusion Struct ScalarValues 
into Substrait Struct Literals and back, as well as converting from Substrait 
Struct type into DF Struct type (other direction already existed).
   
   Substrait doesn't contain names in its Struct fields. For e.g. initial 
schema, the names are provided separately. This PR only properly supports 
un-named structs - which in DataFusion get default field names of form "c0", 
"c1", ... Other structs can also be converted but they'll be renamed 
automatically into the default names.
   
   The VirtualTable PR will then provide better support for named structs.
   
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   ## Are these changes tested?
   
   Adds round-trip unit tests
   
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   ## Are there any user-facing changes?
   
   More things are now supported, but I don't think Substrait support status is 
covered by documentation currently?
   
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