Github user maropu commented on the pull request:
https://github.com/apache/spark/pull/11461#issuecomment-191077441
I tried another quick check by using a `inventry` table in TPC-DS (scale=1)
and the table has
(inv_date_sk INT, inv_item_sk INT, inv_warehouse_sk INT,
inv_quantity_on_hand INT) as a schema;
```
parquet size on disk: 15.0MB
IntDelta: 37.3MB
IntDeltaBinaryPacking: 20.7MB
```
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