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justinh
Advocate IV
Advocate IV

Add Index Column without breaking Query Folding?

Is it possible to add an Index Column without breaking Query Folding?
My data source is SAP HANA. 

1 ACCEPTED SOLUTION
Payeras_BI
Super User
Super User

Hi @justinh ,

Not according to this:

Payeras_BI_0-1656597607198.png

 

If this post answered your question, please mark it as a solution to help other users find useful content.
Kudos are another nice way to acknowledge those who tried to help you.

J. Payeras
Mallorca, Spain

View solution in original post

4 REPLIES 4
Payeras_BI
Super User
Super User

Hi @justinh ,

Not according to this:

Payeras_BI_0-1656597607198.png

 

If this post answered your question, please mark it as a solution to help other users find useful content.
Kudos are another nice way to acknowledge those who tried to help you.

J. Payeras
Mallorca, Spain

Just to add an explanation to this, you cannot not break query folding when adding an index, as it does need to go through each row of the table, remember where it has added each index and keep it there.




Feel free to connect with me:
LinkedIn

Theoretically, couldn't Microsoft translate adding an index into something that does fold into a native query? E.g. something like this pattern:

SELECT 
  [...]
  ROW_NUMBER(ORDER BY [...]) AS index
FROM [...]

 

While it's not currently implemented this way, is there anything fundamentally preventing indexing from being folded into a native query?

This would be very helpful to add surrogate integer keys without processing every row within Power Query. 

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