IgorBerman commented on pull request #249:
URL: https://github.com/apache/parquet-mr/pull/249#issuecomment-981138780


   Hi @tsdeng and @isnotinvain 
   I'm a bit late for the party, but
   have you considered using fastutils object-2-object map for nulls cache?
   for sparse schemas this cache's putVal becomes kind of hot point, so I'm 
wondering if it can be further optimised


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