Github user viirya commented on the issue:
https://github.com/apache/spark/pull/13439
For the partition columns and null columns, we don't need to allocate full
capacity for the number of rows. Because there is only one value in these
columns. Yes, we only need allocate the space for 1 row.
I have another implementation that doesn't change the number of concrete
implementation. If this is the concern you have, I will change it to the
implementation.
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