Github user ConeyLiu commented on the issue:
https://github.com/apache/spark/pull/17936
You are saying to use `MemoryAndDiskArray` cached
dataï¼`UnsafeCartesianRDD` also use `ExternalAppendOnlyUnsafeRowArray` to
caching data. But in that implementation, we need fetch data for each task.
However, we only fetch data per executor when cache data to `BlockManager`.
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