Github user liancheng commented on a diff in the pull request: https://github.com/apache/spark/pull/14957#discussion_r84406104 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileSourceStrategy.scala --- @@ -97,7 +99,15 @@ object FileSourceStrategy extends Strategy with Logging { dataColumns .filter(requiredAttributes.contains) .filterNot(partitionColumns.contains) - val outputSchema = readDataColumns.toStructType + val outputSchema = if (fsRelation.sqlContext.conf.isParquetNestColumnPruning + && fsRelation.fileFormat.isInstanceOf[ParquetFileFormat]) { + val totalSchema = readDataColumns.toStructType + val prunedSchema = StructType( + generateStructFieldsContainsNesting(projects, totalSchema)) + // Merge schema in same StructType and merge with filterAttributes + prunedSchema.fields.map(f => StructType(Array(f))).reduceLeft(_ merge _) + .merge(filterAttributes.toSeq.toStructType) + } else readDataColumns.toStructType --- End diff -- Please re-format the above change to the following format: ```scala if ( ... && ... ) { ... } else { ... } ```
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