jerqi opened a new pull request #32856:
URL: https://github.com/apache/spark/pull/32856


   ### What changes were proposed in this pull request?
   The STRUCT type syntax is defined like this:
   
   STRUCT(fieldNmae: fileType [NOT NULL][COMMENT stringLiteral][,.....])
   
   So the field list is NEARLY the same as a column list
   
   if we could make ':' optional it would be so much cleaner an less proprietary
   
   
   ### Why are the changes needed?
   ease of use
   
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   ### How was this patch tested?
   unit tests
   


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