topic Re: Dataflow::Can't save content to Lakehouse if I filter it first with date in Dataflow

Dataflow::Can't save content to Lakehouse if I filter it first with date

TimoRiikonen — Mon, 22 Apr 2024 11:50:31 GMT

I wish to:

1) Copy data from Lakehouse bronze layer to the same Lakehouse silver layer

2) Remove extra columns

3) Only copy today's and yesterday's data

First two steps work fine, but when I add the third step, then I get an error.

Silver table:

Code to create yesterday's date:

Date.AddDays( Date.From( DateTime.LocalNow() ), -1)

Result is 4/21/2024 (or 4/12/2024), so the date is in US-en format, same as in Lakehouse.

Code to do the data copying:

let Source = Lakehouse.Contents([]), #"Navigation 1" = Source{[workspaceId = "8466c1bc-e477-415e-8b77-a714cd043631"]}[Data], #"Navigation 2" = #"Navigation 1"{[lakehouseId = "f236f3df-1701-4605-842d-415b6cb3ba37"]}[Data], #"Navigation 3" = #"Navigation 2"{[Id = "ServiceRequest", ItemKind = "Table"]}[Data], #"Removed other columns" = Table.SelectColumns(#"Navigation 3", {"Tilaus_id", "Pyynnön_alatyyppi", "Pyyntötyyppi", "Pyyntötyyppi_id", "Tilaus", "Updated"}), #"Changed column type" = Table.TransformColumnTypes(#"Removed other columns", {{"Updated", type date}}), #"Filtered rows" = Table.SelectRows(#"Changed column type", each [Updated] >= MinUpdateDate) in #"Filtered rows"

When I refresh my data, everything works still fine:

Publish over new or existing, same result:

After I publish it, I get this error:

ServiceRequest_WriteToDataDestination: Mashup Exception Expression Error Couldn't refresh the entity because of an issue with the mashup document MashupException.Error: Expression.Error: We cannot apply operator < to types Table and Date. Details: Reason = Expression.Error;Operator = <;Left = error "Microsoft.Mashup.Engine1.Runtime.ValueException: [Expression.Error] Value was not specified.#(cr)#(lf) at Microsoft.Mashup.Engine1.Language.ValueCreator.CreateValueForThrow(IThrowExpression throwExpr)#(cr)#(lf) at Microsoft.Mashup.Engine1.Language.ValueCreator.<>c__DisplayClass23_0.<CreateValueForRecord>b__0(Int32 index)#(cr)#(lf) at Microsoft.Mashup.Engine1.Runtime.RecordValue.DemandRecordValue.get_Item(Int32 index)#(cr)#(lf) at Microsoft.Data.Mashup.ProviderCommon.MashupResource.TryGetValue(Func`1 getValue, IValue& value, String& errorMessage)#(cr)#(lf)Record";Right = 4/17/2024 12:00:00 AM;Microsoft.Data.Mashup.Error.Context = User

If I remove the last filter, then everything works as it should (I had -10, not -1 so ignore the date):

Re: Dataflow::Can't save content to Lakehouse if I filter it first with date

miguel — Mon, 22 Apr 2024 11:32:15 GMT

Is your query that calculate the date set to be staged? If yes, please disable staging for it and try running the dataflow again

Re: Dataflow::Can't save content to Lakehouse if I filter it first with date

TimoRiikonen — Mon, 22 Apr 2024 11:35:02 GMT

I tested filtering on ID field and there was no issues then.

Re: Dataflow::Can't save content to Lakehouse if I filter it first with date

miguel — Mon, 22 Apr 2024 11:39:25 GMT

Upon further inspection of the error, my suspicion is correct. The query MinUpdateDate is more than likely set to be staged which causes the result of the query to be set to a table. Then you're trying to use that table value as a filter to a column that expects a date and that's why the error displays that specific error message.

The solution is to disable the staging from the MinUpdateDate query.

Re: Dataflow::Can't save content to Lakehouse if I filter it first with date

TimoRiikonen — Mon, 22 Apr 2024 11:49:43 GMT

Hello Miguel,

You were correct.

Table was not staged, but the parameter was.

After removing this, it is working again.

Thank you!

Re: Dataflow::Can't save content to Lakehouse if I filter it first with date

v-cboorla-msft — Mon, 22 Apr 2024 13:15:40 GMT

Hi TimoRiikonen

Glad that you query got resolved.
Please continue using Fabric Community for further queries.

Thanks.