cloud-fan commented on a change in pull request #23387: [SPARK-26447][SQL]Allow
OrcColumnarBatchReader to return less partition columns
URL: https://github.com/apache/spark/pull/23387#discussion_r244036366
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/datasources/orc/OrcColumnarBatchReader.java
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@@ -58,10 +58,16 @@
/**
* The column IDs of the physical ORC file schema which are required by this
reader.
- * -1 means this required column doesn't exist in the ORC file.
+ * -1 means this required column is partition column, or it doesn't exist in
the ORC file.
*/
private int[] requestedColIds;
+ /**
+ * The column IDs of the ORC file partition schema which are required by
this reader.
+ * -1 means this required column doesn't exist in the ORC partition columns.
Review comment:
`-1 means this required column is not a partition column`
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