emkornfield commented on pull request #12706:
URL: https://github.com/apache/arrow/pull/12706#issuecomment-1086357554


   > @pitrou @emkornfield am I understanding this right? It seems we either 
need to write out the values of child arrays behind null slots, or fill in some 
value on read?
   
   Yes, if it required will need to make sure the children are not null.  I'm 
not surprised feather works because that is just serialized the record batch in 
place.  Parquet only stores non-null values.  Probably the element of least 
surprise here would be to only fill values for non-nullable columns (and leave 
existing behavior in for nullable).


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