Github user kiszk commented on the pull request:
https://github.com/apache/spark/pull/10833#issuecomment-188078039
According to
https://github.com/apache/spark/blob/3708d13f1a282a9ebf12e3b736f1aa1712cbacd5/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/ColumnarBatch.java#L38,
this structure is designed for performance rather than memory footprint.
Close this PR for now
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