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[SPARK-30312][DOCS][FOLLOWUP] Add a migration guide #27269

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[SPARK-30312][DOCS][FOLLOWUP] Add a migration guide #27269

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4 changes: 4 additions & 0 deletions docs/sql-migration-guide.md
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Expand Up @@ -340,6 +340,10 @@ license: |

- 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.

## Upgrading from Spark SQL 2.4.4 to 2.4.5

- Since Spark 2.4.5, `TRUNCATE TABLE` command tries to set back original permission and ACLs during re-creating the table/partition paths. To restore the behaviour of earlier versions, set `spark.sql.truncateTable.ignorePermissionAcl.enabled` to `true`.

## Upgrading from Spark SQL 2.4 to 2.4.1

- The value of `spark.executor.heartbeatInterval`, when specified without units like "30" rather than "30s", was
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