dongjoon-hyun opened a new pull request #27270: [SPARK-28152][SQL][FOLLOWUP] Add a migration guide for MsSQLServer JDBC dialect URL: https://github.com/apache/spark/pull/27270 ### What changes were proposed in this pull request? This PR adds a migration guide for MsSQLServer JDBC dialect for Apache Spark 2.4.4 and 2.4.5. ### Why are the changes needed? Apache Spark 2.4.4 updates the type mapping correctly according to MS SQL Server, but missed to mention that in the migration guide. In addition, 2.4.4 adds a configuration for the legacy behavior. ### Does this PR introduce any user-facing change? Yes. This is a documentation change. ### How was this patch tested? Manually generate and see the doc.
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