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Update sql-migration-guide.md
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AngersZhuuuu committed Dec 29, 2020
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- In Spark 3.2, `ALTER TABLE .. RENAME TO PARTITION` throws `PartitionAlreadyExistsException` instead of `AnalysisException` for tables from Hive external when the target partition already exists.

- In Spark 3.2, script transform default `FIELD DELIMIT` is `\u0001` for no serde mode. In Spark 3.1 or earlier, the default `FIELD DELIMIT` is `\t`.
- In Spark 3.2, script transform default FIELD DELIMIT is `\u0001` for no serde mode. In Spark 3.1 or earlier, the default FIELD DELIMIT is `\t`.

## Upgrading from Spark SQL 3.0 to 3.1

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