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Unable to restore table version after enabling columnMapping

Data_Alchemist
New Contributor

2 weeks ago

i can not restore my delta table to a previous version after I have enabled columnMapping. 

The following error is shown:

DeltaColumnMappingUnsupportedException: Changing column mapping mode from 'name' to 'none' is not supported.

Any idea how to roll back?

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1 REPLY 1

szymon_dybczak
Contributor

2 weeks ago

Hi @Data_Alchemist ,

In Databricks Runtime 15.3 and above, you can use the DROP FEATURE command to remove column mapping from a table and downgrade the table protocol.

Then you can try to restore table to previous version.

https://docs.databricks.com/en/delta/column-mapping.html#disable-column-mapping

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