cloud-fan commented on issue #26231: [SPARK-29572][SQL] add v1 read fallback 
API in DS v2
URL: https://github.com/apache/spark/pull/26231#issuecomment-573506035
 
 
   Similar to v1 write fallback API which uses v2 API to config the write, I 
think it makes more sense to use V2 API to do operator pushdown. That's why the 
V1 scan should be a `TableScan` not `PrunedFilteredScan`, as the pushdown 
should already be done at that point.

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