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SaaM's avatar
SaaM
Icon for Helper II rankHelper II
5 years ago
Solved

Duplicate or refer Table ? Or someting else

Hi All,   i am facing terrible performance in a power query table after a couple of joins and transformation. Let me give you a broad overview over the steps i do. It would be great to find out w...
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  • Anonymous's avatar
    Anonymous
    5 years ago

    No!

    You have to use a separate expression for 

    Table.SelectColumns(Table.SelectRows(Table1, (sel)=> sel[#"filter_item"] = 1)),{"key_1", "field_1", "field_2", "field_3", "field_4", "field_5"})

     

    for instance:

     

     

    TABBUFF=Table.Buffer(Table.SelectColumns(Table.SelectRows(Table1, (sel)=> sel[#"filter_item"] = 1)),{"key_1", "field_1", "field_2", "field_3", "field_4", "field_5"}),

     

     

     

    then the rest (check the sintax: ican't do)

     

     

    #"join_sum_T1_T2_" = let #"GroupedLines" = Table.Group(TABBUFF, {"key", "filter_item"}, {{"sum_field_1", each List.Sum([#"field_1"]), type nullable number}, {"sum_field_2", each List.Sum([field_32), type nullable number}, {"Ssum_field_3", each List.Sum([#"field_3"]), type nullable number}, {"sum_field_4", each List.Sum([#"field_4"]), type nullable number}}), #"MergedQueries" = Table.NestedJoin(#"Table2_source", {"key_2"}, 
#"GroupedLines", {"key_1"}, "Table1_sum", JoinKind.LeftOuter), 
#"Tableexpanded" = Table.ExpandTableColumn(#"MergedQueries", "Table1_sum", {"sum_field_1", "sum_field_2", "sum_field_3", "sum_field_4"}, {"sum_field_1", "sum_field_2", "sum_field_3", "sum_field_4"}) 
in #"Tableexpanded",

     

     

     

     

     

edhans's avatar
edhans
Icon for Community Champion rankCommunity Champion
5 years ago

You can try to use Table.Buffer() around the last step of one of your tables. It would be helpful though to know what the 38 custom columns are - (calculated columns are a DAX thing, not Power Query) and then we could see if you had a model issue or a better way to approach this.

 

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  • SaaM's avatar
    SaaM
    Icon for Helper II rankHelper II
    5 years ago

    Thanks for your reply.

     

    I tried your solution Table.Buffer(myTable), but it reacts the same if i did a reference or a duplicate, i.e it executes all the previous queries again and again.

     

    What I meant by calculated columns, it's added columns to the original Source with power query formulas (sums of columns with group by key, row counts with group by key etc...).

     

    I start in my model with my original Table with 20 columns and end with a Table with 58 columns (20+38 added columns)

     

     

    What I am looking for is something similar or that does the same thing as in Excel (Copy and paste table values without the formulas and calculus).

     

     

    Kind regards