TiFlash table scan performance gain after mpp column prune enhancement #8962
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Description
General Question
After pingcap/tidb#52143, the tpc-ds 50 query-72 TableScan cost changed. The total query time of query-72 changed from 5.71s to 3.72s, and the TableScan of catalog_sales changed from 3.21s to 1.72s.
However, the data bytes read from Storage layer does not affected. We need to investigate why the cost of "TableScan" is changed.