topic Re: Data Pipeline Error (Parquet File > FabricDWH) TypeConversion is not supported by the external cmd in Pipelines

Data Pipeline Error (Parquet File > FabricDWH) TypeConversion is not supported by the external cmd

jochenj — Mon, 30 Oct 2023 10:27:59 GMT

Situation:

i struggle to load a parquet file to DWH.

The Parquet File has a column "Info" which is nvarchar(max)

FabricDWH does only support a max of varchar(8000)

I would be fine if the column-data gets truncated on import to DWH so that only first 8000 characters are stored in DWH

Problem:

If i create a Fabric Pipeline with Copy Activity with/without Column Mapping i get:

ErrorCode=UserErrorSqlDWCopyCommandError,'Type=Microsoft.DataTransfer.Common.Shared.HybridDeliveryException,Message=SQL DW Copy Command operation failed with error 'String or binary data would be truncated while reading column of type 'VARCHAR(8000)

There are no options in PipelineUI Sink or Mapping Tab to define a convert or "allow truncate" o explicit type casts

so i tried to define "dynamic content" with a TabularTanslator in Mapping Tab of Copy Activity:

{"type": "TabularTranslator"
,"typeConversion": true
,"typeConversionSettings": {"allowDataTruncation": true
,"treatBooleanAsNumber": false}
}

This worked in AzureADF without issues, but when using in Fabric Pipeline i get error:

ErrorCode=UnsupportCopyFeatureInExternalCommand,The copy feature: TypeConversion is not supported by the external command SynapseImportCommand

Now the questions:

Does anyone know if defining a custom tabular translator is even supported in current Fabric Pipeline vesion?
Does anyone have a workaround how to do BASIC type conversion as needed in my scenario? Yes i think i could do the same with a Dataflow Gen2 instead but Dataflows then would have other issues like the lack of parametrization of dataflow...

Re: Data Pipeline Error (Parquet File > FabricDWH) TypeConversion is not supported by the external cmd

Anonymous — Mon, 30 Oct 2023 13:00:46 GMT

Hi jochenj,
Thanks for using the Fabric community,

Data truncate is not a supported feature in DWH. Thus Data pipeline cannot support truncate for Parquet -> DWH. However Data pipeline can support skip incompatibly rows and output incompatibly rows by 'Settings'->'Fault Tolerance'.

Hope this is helpful. Incase of any further queries do let us know.

Re: Data Pipeline Error (Parquet File > FabricDWH) TypeConversion is not supported by the external cmd

jochenj — Mon, 30 Oct 2023 15:42:54 GMT

thanks for the insights. Can you confirm that even "renaming" of columns with a dynamic TabularTranslator expression should work? Or is this also not implemented yet?

Re: Data Pipeline Error (Parquet File > FabricDWH) TypeConversion is not supported by the external cmd

Anonymous — Tue, 31 Oct 2023 06:01:53 GMT

Hi jochenj ,

Dynamic TabularTranslator should be supported.

Re: Data Pipeline Error (Parquet File > FabricDWH) TypeConversion is not supported by the external cmd

Anonymous — Wed, 01 Nov 2023 18:02:05 GMT

Hello jochenj ,

We haven’t heard from you on the last response and was just checking back to see if your query got resolved? Otherwise, will respond back with the more details and we will try to help.

Re: Data Pipeline Error (Parquet File > FabricDWH) TypeConversion is not supported by the external cmd

Anonymous — Fri, 03 Nov 2023 06:41:41 GMT

Hi jochenj ,

Glad to know your query got resolved. Please continue using Fabric Community incase of any queries.