Github user chiwanpark commented on the issue: https://github.com/apache/flink/pull/1996 Looks good to me, +1. I'll merge this in few hours. But I think we should change the type of row index to `Long` in near future. I think we can deal with the incompatibility problem with local matrices by assuming that the number of rows is less than `Int.MaxValue` and converting row index type from `Long` to `Int` in collecting time. I'll submit an issue related to this to JIRA after merge this.
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