[GitHub] [spark] gatorsmile commented on a change in pull request #23150: [SPARK-26178][SQL] Use java.time API for parsing timestamps and dates from CSV

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gatorsmile commented on a change in pull request #23150: [SPARK-26178][SQL] Use java.time API for parsing timestamps and dates from CSV
URL: https://github.com/apache/spark/pull/23150#discussion_r360966895
 
 

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 File path: docs/sql-migration-guide-upgrade.md
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 @@ -33,6 +33,8 @@ displayTitle: Spark SQL Upgrading Guide
 
   - Spark applications which are built with Spark version 2.4 and prior, and call methods of `UserDefinedFunction`, need to be re-compiled with Spark 3.0, as they are not binary compatible with Spark 3.0.
 
+  - Since Spark 3.0, CSV datasource uses java.time API for parsing and generating CSV content. New formatting implementation supports date/timestamp patterns conformed to ISO 8601. To switch back to the implementation used in Spark 2.4 and earlier, set `spark.sql.legacy.timeParser.enabled` to `true`.
 
 Review comment:
   We removed this conf in the follow-up PRs? 

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