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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/08/02 03:02:53 UTC

[GitHub] [arrow] emkornfield commented on pull request #7319: ARROW-8289: [Rust] Parquet Arrow writer with nested support

emkornfield commented on pull request #7319:
URL: https://github.com/apache/arrow/pull/7319#issuecomment-667618090


   > IMO we can solve this in two steps: 1) have a top-level method to compute def/rep levels for all leaf arrays of a given an arrow array, and then 2) use column writer to write Parquet value/def/rep using the result from the previous step and the input leaf array.
   
   FWIW, this is the approach the C++ code takes (supports arbitrary nessting).  One thing to note which is currently a bug in C++ is once rep/def levels are computed for any anything 
    with deep nesting (any leaf column one or more direct struct/group ancestor), nullness should be determined rep/def-levels and not leaf-arrays (this is currently a bug in C++).


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