Expanding ListColumns within Nested Tables

[JamesMcEwan]

Hi all, 

I am looking to expand a ListColumn within a nested table, however I would like to so this without adding a new column. Is there a way to expand the list without adding a new column to the table or the nested table?

Here is an example close to how my data would look:

let
    Source =  
        Table.FromRecords(
            {
                [Name = "Bob",  Color = "Blue"],
                [Name = "Jim",  Color = "Yellow"],
                [Name = "Paul", Color = "Green"]
            }
        )
in 
    Table.AddColumn (Source, "TypeID", each 
        Table.FromRecords(
            {
                [Type= "Small",     ID = {1,2,3}],
                [Type = "Medium",   ID = {2,4,6}],
                [Type = "Large",    ID = {1,3,6}]
            }
        )
    )

[artpil · Accepted solution]

Hi,

So you probably want something like this:

let
    Source =  
        Table.FromRecords(
            {
                [Name = "Bob",  Color = "Blue"],
                [Name = "Jim",  Color = "Yellow"],
                [Name = "Paul", Color = "Green"]
            }
        ),
#"AddTab;e"=
    Table.AddColumn (Source, "TypeID", each 
        Table.FromRecords(
            {
                [Type= "Small",     ID = {1,2,3}],
                [Type = "Medium",   ID = {2,4,6}],
                [Type = "Large",    ID = {1,3,6}]
            }
        )
    ),
    TransformColumn = Table.TransformColumns(#"AddTab;e",{"TypeID", each Table.ExpandListColumn(_, "ID")})
in
    TransformColumn

Hope it helps,

Artur

[JamesMcEwan]

Hi @artpil,

This is great and worked a treat. I also had just figured out my own solution - so will copy below, in case there is a use case for either. 

Thanks!

let
    Source =  
        Table.FromRecords(
            {
                [Name = "Bob",  Color = "Blue"],
                [Name = "Jim",  Color = "Yellow"],
                [Name = "Paul", Color = "Green"]
            }
        )
in 
    Table.AddColumn (Source, "TypeID", 
        each 
            let 
                _usertable = 
                    Table.FromRecords(
                        {
                            [Type= "Small",     ID = {1,2,3}],
                            [Type = "Medium",   ID = {2,4,6}],
                            [Type = "Large",    ID = {1,3,6}]
                        }
                    )   
            in 
                Table.ExpandListColumn(
                    _usertable,"ID"
                )
    )

[SolomonovAnton]

hello 

if I correctly understood you below result which you want

let
    Query1 = let
    Source =  
        Table.FromRecords(
            {
                [Name = "Bob",  Color = "Blue"],
                [Name = "Jim",  Color = "Yellow"],
                [Name = "Paul", Color = "Green"]
            }
        )
in 
    Table.AddColumn (Source, "TypeID", each 
        Table.FromRecords(
            {
                [Type= "Small",     ID = {1,2,3}],
                [Type = "Medium",   ID = {2,4,6}],
                [Type = "Large",    ID = {1,3,6}]
            }
        )
    ),
    #"Expanded TypeID" = Table.ExpandListColumn(Table.ExpandTableColumn(Query1, "TypeID", {"ID"}, {"ID"}), "ID")
in
    #"Expanded TypeID"

[JamesMcEwan]

Hi @SolomonovAnton,

Almost - I want this result without having expanded the table TypeID table. So it should look like this:

The query table:

The TypeID table for record [Bob]:

Thanks!

[Anonymous]

Hi James,

Did you get the result you wanted? I'm trying to find out how to do the exact same type of issue

The query table:

The TypeID table for record [Bob]:

[JamesMcEwan]

Hi @Anonymous ,

I did get this to work - if you look at my last reply above - I copied in the the solution to my reply to @artpil 

[Anonymous]

Hi James,

Did you get the result you wanted? I'm trying to find out how to do the exact same type of issue

The query table:

The TypeID table for record [Bob]: