Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/10502#discussion_r48590538 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFilters.scala --- @@ -208,11 +210,30 @@ private[sql] object ParquetFilters { } /** + * Return referenced columns in [[sources.Filter]]. + */ + def referencedColumns(schema: StructType, predicate: sources.Filter): Array[String] = { + val dataTypeOf = schema.map(f => f.name -> f.dataType).toMap + val referencedColumns = ArrayBuffer.empty[String] + def getDataTypeOf(name: String): DataType = { + referencedColumns += name + dataTypeOf(name) + } + createParquetFilter(getDataTypeOf, predicate) --- End diff -- `createParquetFilter ` needs to be called to have the list of referenced columns while creating filters. If you meant `ParquetFilters.createFilter` should be called once as returning both the columns and filter, I originally wanted to do so but I realised calling twice like this would reduce the changes.
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