sql server - Entity Framework, variable criteria runs much more slowly -

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the following runs <0.3s, constant in predicate condition

iqueryable<fn_getdocumentsforcontact_result> _queriable; var zeus = new zeus(); var uow = new unitofwork(zeus); var sp = new storedprocedureservice(zeus);  int _userid = 183494; int totalrecords = 0; int doctype = 2;  var predicate = predicatebuilder.true<fn_getdocumentsforcontact_result>();  predicate = predicate.and(x=>x.type == 2);  iqueryable<fn_getdocumentsforcontact_result> documents =      sp.fn_getdocumentsforcontact(183494)     .asexpandable()     .where(predicate);  _queriable = documents;  _queriable.count().dump();

generates following sql:

-- region parameters declare @ctcidnumber int = 183494 declare @p__linq__0 int = 2 -- endregion select      [groupby1].[a1] [c1]     ( select          count(1) [a1]         [dbo].[fn_getdocumentsforcontact](@ctcidnumber) [extent1]         [extent1].[type] = @p__linq__0     )  [groupby1]

if change:

predicate = predicate.and(x=>x.type == 2);

to

predicate = predicate.and(x=>x.type == doctype);

the same sql still generated, db connection times out.

the sql runs through ssms, i've tried clearing query cache , running sql through sp_executesql, in both scenarios query executes in under 1 second. removing linqkit predicate builder makes no difference either.

my initial instinct have been parameter sniffing, however, query in question calls inline tvf , understanding ps applies compiled sprocs.


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