Unroll JSON and include prefix

[ctwig76]

Hello,

I'm unrolling JSONs with shifting tag names. I need to include the parent tag name as a prefix as sometimes the nested tags have the same tag name

#"Expanded sessions.geo_info.country" = Table.ExpandRecordColumn(#"Renamed Columns5", "country", List.Buffer(List.Union(List.Transform(#"Renamed Columns5"[country], each Record.FieldNames(_))))),

Can someone advise how I can add "country." as a prefix to the field names that are expanded?

[v-yangliu-msft]

Hi  @ctwig76 ,

You can try using the following function to modify the column name by merging the parent tag name as a prefix:

Table.TransformColumnNames - PowerQuery M | Microsoft Learn

Table.RenameColumns - PowerQuery M | Microsoft Learn

Best Regards,

Liu Yang

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.