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Marwen TALEB
MVP ⭐️⭐️⭐️⭐️⭐️
Marwen TALEB
MVP ⭐️⭐️⭐️⭐️⭐️
November 24, 2025
Solved

try_get_unit udf cannot resolve dimensionless:unitless unit

  • November 24, 2025
  • 1 reply
  • 55 views

Hello, 

Although “unitless” is an alias of the dimensionless:unitless unit, try_get_unit(“unitless”) returns null.

ref: https://github.com/cognitedata/units-catalog/blob/main/versions/v1/units.json#L1699

 

Could you please have a look?

 

Thanks!

    Best answer by Everton Colling

    Hi ​@Marwen TALEB!

    There are currently two units from different quantities that possess the alias "unitless". When using the try_get_unit UDF, if the function encounters more than one unit, it returns null due to the ambiguity.

    That being said, you can add "Dimensionless" or "Dimensionless Ratio" as a 2nd argument (quantity) to try_get_unit to circumvent the ambiguity, and that will return the associated unit, as the catalog enforces unique aliases within a quantity, but not across quantities.

    1 reply

    Everton Colling
    Expert ⭐️⭐️⭐️⭐️
    Everton CollingAnswer
    Expert ⭐️⭐️⭐️⭐️
    November 25, 2025

    Hi ​@Marwen TALEB!

    There are currently two units from different quantities that possess the alias "unitless". When using the try_get_unit UDF, if the function encounters more than one unit, it returns null due to the ambiguity.

    That being said, you can add "Dimensionless" or "Dimensionless Ratio" as a 2nd argument (quantity) to try_get_unit to circumvent the ambiguity, and that will return the associated unit, as the catalog enforces unique aliases within a quantity, but not across quantities.

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