[Spark] Remove dropped columns when running REORG PURGE #3371
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Which Delta project/connector is this regarding?
Description
According to #3228, we add the support to also find and remove dropped columns when running
REORG PURGE
.Close #3228.
How was this patch tested?
Through unit test in
DeltaReorgSuite.scala
.Does this PR introduce any user-facing changes?
No.