Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/16578#discussion_r139331293 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetReadSupport.scala --- @@ -63,9 +74,22 @@ private[parquet] class ParquetReadSupport extends ReadSupport[UnsafeRow] with Lo StructType.fromString(schemaString) } - val parquetRequestedSchema = + val clippedParquetSchema = ParquetReadSupport.clipParquetSchema(context.getFileSchema, catalystRequestedSchema) + val parquetRequestedSchema = if (parquetMrCompatibility) { + // Parquet-mr will throw an exception if we try to read a superset of the file's schema. + // Therefore, we intersect our clipped schema with the underlying file's schema --- End diff -- `clipParquetSchema` can add column paths only exist in catalyst schema into parquet schema. I think those columns are useful but looks like the `intersectParquetGroups` will remove them again?
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