Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/729#issuecomment-42913020
Seems we are adding more `Project`s (for example, `Project
[i_brand_id#224:0,i_item_sk#217:1,i_brand#225:2]` after `Filter
(i_manufact_id#70:13 = 436)`). Do we need those `Project`s after we have pruned
those leaf nodes (e.g. `HiveTableScan`)?
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