Expanded Column Source causing issues when applying query

[Anonymous]

Hi,

I get the following error message when trying to apply a query which has had a column expanded:

"Failed to save modifications to the server. Error returned: 'OLE DB or ODBC error: [Expression.Error] The Column 'Column1' of the table wasn't found.. '."

I believe this is because when the Column1 column was expanded in my data source that it is theoretically no longer there when the query is being applied.

My query is as follows:

let
    PageRange = {1..100},
    Source = List.Transform(PageRange, each try {_, GetData(_)} otherwise null),
    First = List.FirstN(Source, each _ <> null),
    Table = Table.FromRows(First, {"Page", "Column1"}),   
    Expanded = Table.ExpandTableColumn(Table, "Column1", {"id", "uid", "siteId", "siteUid"})
in
    Expanded

I've done research on here but all threads don't seem to end in a solution.

Please help!

Thanks in advance,

Shaun

[v-jiascu-msft]

Hi @Anonymous ,

Could you please mark the proper answers as solutions?

Best Regards,

[v-jiascu-msft]

Hi Shaun,

It can work in my test based on your description here. I'm afraid there could be something wrong in other parts. You named the column "Column1". So that would not a problem. Please refer to the snapshots below.

Can you share the code of GetData? Please mask the sensitive parts.

Best Regards,

[Anonymous]

OK. I think i know the issue.

My code pulls down entries from a data source where i don't know how many entries there will be (hence the PageRange). As such at the end of the data set the last row always errors which i think then causes the initial problem... still not sure how to fix it though!