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https://issues.apache.org/jira/browse/ARROW-4221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17040125#comment-17040125
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Antoine Pitrou commented on ARROW-4221:
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[~mrkn] If this is still needed, it would be good to do so before 1.0.0.
> [Format] Add canonical flag in COO sparse index
> -----------------------------------------------
>
> Key: ARROW-4221
> URL: https://issues.apache.org/jira/browse/ARROW-4221
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Format
> Reporter: Kenta Murata
> Priority: Minor
> Labels: sparse
>
> To support the integration with scipy.sparse.coo_matrix, it is necessary to
> add a flag in SparseCOOIndex. This flag denotes whether elements in COO
> sparse tensor is sorted lexicographically or not.
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