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Steps to reproduce this error:

Step 1: I have a Big query which has couple of columns & "email" column is clustered.

Step 2: I have also applied Policy tagging (dynamic data masking) on this clustered column.

Step 3: Post applying I am unable to query this entire table & it throws an error

Sample screenshots below: "email" column is clustered: Step 1:

Policy tagging applied Step 2:

Error enter image description here

From the error "Data masking cannot be applied" data masking is applied on each column using the policy tags mentioned & now it is not possible on clustered columns.

I need to apply dynamic data masking feature in Big query for a clustered column. I can find this as a limitation in Google docs here but, what is the reason behind it?

Viknesh S K
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  • I cant see documentation regarding this, but for future reference you can check this release page from Google: https://cloud.google.com/bigquery/docs/release-notes – Nestor Ceniza Jr Mar 27 '23 at 14:59

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