guiyanakuang commented on pull request #28860:
URL: https://github.com/apache/spark/pull/28860#issuecomment-653544529


   org.apache.spark.sql.execution.ProjectionOverSchema.scala. A Scala extractor 
that projects an expression over a given schema. I think this code also needs 
to have matching rules added to it. To support nested ArrayStruct. Otherwise, 
ParquetSchemaPruning won't work either.


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