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[SPARK-30282][DOCS][FOLLOWUP] Update SQL migration guide for SHOW TBLPROPERTIES #27276

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[SPARK-30282][DOCS][FOLLOWUP] Update SQL migration guide for SHOW TBLPROPERTIES #27276

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Update sql-migration-guide.md
imback82 Jan 19, 2020
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Merge branch 'master' into SPARK-30282-followup
imback82 Jan 19, 2020
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Update sql-migration-guide.md
imback82 Jan 19, 2020
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- Since Spark 3.0, `ADD FILE` can be used to add file directories as well. Earlier only single files can be added using this command. To restore the behaviour of earlier versions, set `spark.sql.legacy.addDirectory.recursive` to false.

- Since Spark 3.0, `SHOW TBLPROPERTIES` on a temporary view will cause `AnalysisException`. In Spark version 2.4 and earlier, it returned an empty result.
- Since Spark 3.0, `SHOW TBLPROPERTIES` will cause `AnalysisException` if the table does not exist. In Spark version 2.4 and earlier, this scenario caused `NoSuchTableException`. Also, `SHOW TBLPROPERTIES` on a temporary view will cause `AnalysisException`. In Spark version 2.4 and earlier, it returned an empty result.

## Upgrading from Spark SQL 2.4.4 to 2.4.5

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