Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/20933#discussion_r179506617 --- Diff: sql/core/src/main/java/org/apache/spark/sql/execution/datasources/orc/OrcColumnarBatchReader.java --- @@ -233,7 +234,7 @@ private boolean nextBatch() throws IOException { if (!copyToSpark) { for (int i = 0; i < requiredFields.length; i++) { - if (requestedColIds[i] != -1) { + if (requestedColIds[i] != -1 && requestedPartitionColIds[i] == -1) { --- End diff -- This implies `requestedColIds[i]` and `requestedPartitionColIds[i]` may both be non-negative, is it possible?
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