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
########## File path: docs/sql-migration-guide-upgrade.md ########## @@ -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 ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
