So i'm translating an existing sql query to sequel.

the sql query has the following join 

inner join Catalog_Hierarchy_Level as CHL
on CHL.Catalog_ID = @catalog_id
and CHL.Hierarchy_Function_ID = CHF.Hierarchy_Function_ID
and ISNULL(CHL.Parent_Hierarchy_Level_Code, 0) = 
CH12.Parent_Hierarchy_Level_Code

i've got the first two parts of this join, but i'm stuck on how to 
translate the line in red to sequel. 


I tried to use Sequel.literal and i got an error unexpected ')' expecting 
tASSOC

inner_join(:catalog_hierarchy_level___chl, :chl__catalog_id => catalog_id, 
:chl__catalog_hierarchy_function_id => :chf__hierarchy_function_id, 
Sequel.literal('ISNULL(CHL.Parent_Hierarchy_Level_Code, 0) = 
CH12.Parent_Hierarchy_Level_Code')).


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