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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/07/01 00:58:35 UTC

[GitHub] [arrow] mrkn commented on pull request #7477: ARROW-4221: [C++][Python] Add canonical flag in COO sparse index

mrkn commented on pull request #7477:
URL: https://github.com/apache/arrow/pull/7477#issuecomment-652124757


   @pitrou In summary, the constraint of the indices order of SparseCOOIndex was removed, but the new flag field is introduced to state whether or not the indices tensor is ordered in a row-major manner.  By this new flag, we can preserve the canonicality or noncanonicality of the sparse tensor before and after serialization.  Preserving this property can avoid needless scanning of the indices tensor after deserialization.


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