[GitHub] [spark] haiboself commented on a change in pull request #23944: [SPARK-26932][DOC] Add a warning for Hive 2.1.1 ORC reader issue

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haiboself commented on a change in pull request #23944: [SPARK-26932][DOC] Add a warning for Hive 2.1.1 ORC reader issue
URL: https://github.com/apache/spark/pull/23944#discussion_r262759756
 
 

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 File path: docs/sql-migration-guide-upgrade.md
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 @@ -169,7 +169,7 @@ displayTitle: Spark SQL Upgrading Guide
 
   - Since Spark 2.4, Spark will display table description column Last Access value as UNKNOWN when the value was Jan 01 1970.
 
-  - Since Spark 2.4, Spark maximizes the usage of a vectorized ORC reader for ORC files by default. To do that, `spark.sql.orc.impl` and `spark.sql.orc.filterPushdown` change their default values to `native` and `true` respectively.
+  - Since Spark 2.4, Spark maximizes the usage of a vectorized ORC reader for ORC files by default. To do that, `spark.sql.orc.impl` and `spark.sql.orc.filterPushdown` change their default values to `native` and `true` respectively. ORC tables created by Spark 2.4 native ORC writer cannot be read by Hive 2.1.1. Use `spark.sql.orc.impl=hive` will restores the previous behavior.
 
 Review comment:
   ok

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