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[SPARK-32685][SQL][FOLLOW-UP] Update migration guide about change default filed.delim to '\t' when user specifies serde #31051

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[SPARK-32685][SQL][FOLLOW-UP] Update migration guide about change default filed.delim to '\t' when user specifies serde #31051

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Update sql-migration-guide.md
AngersZhuuuu Jan 6, 2021
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Update sql-migration-guide.md
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2 changes: 1 addition & 1 deletion docs/sql-migration-guide.md
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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, serde property `field.delim` is `\t` for Hive serde mode when user specifies serde. In Spark 3.1 or earlier, the default FIELD DELIMIT is `\t`, serde property `field.delim` is `\u0001` for Hive serde mode when user specifies serde.

## Upgrading from Spark SQL 3.0 to 3.1

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