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[SPARK-23312][SQL][FOLLOWUP] add a config to turn off vectorized cach…
…e reader ## What changes were proposed in this pull request? #20483 tried to provide a way to turn off the new columnar cache reader, to restore the behavior in 2.2. However even we turn off that config, the behavior is still different than 2.2. If the output data are rows, we still enable whole stage codegen for the scan node, which is different with 2.2, we should also fix it. ## How was this patch tested? existing tests. Author: Wenchen Fan <email@example.com> Closes #20513 from cloud-fan/cache. (cherry picked from commit ac7454c) Signed-off-by: gatorsmile <firstname.lastname@example.org>
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