Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20933#discussion_r178306300
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/execution/datasources/orc/OrcColumnarBatchReader.java
---
@@ -171,47 +174,39 @@ public void initBatch(
// Initialize the missing columns once.
--- End diff --
it's not only missing columns not, but also partition columns
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