tsql - Slow join on multiple conditions -


that join [docsvsys] [docsvsysreturn] killing query
3 condition join killing - turn loop join
take on 2 minutes
if take out or( [docsvsysreturn].[sparid] = [corecte].[sparid] , [docsvsysreturn].[sparid] = [docsvsysreturn].[sid] ) runs in 1 second s tried merge , hash join not allowed
columns involved indexed
[sid] pk , [sparid] required , fk [sid]
thoughts on how fix performance? 

; corecte (   select [docsvsysauth].[sid], [docsvsysauth].[sparid]     [docsvsys] [docsvsysauth] (nolock)     join [docsvtext] [table] (nolock)       on [table].[sid] = [docsvsysauth].[sid]      , [docsvsysauth].[visibility] in (0)      , [table].[fieldid] = '108'    [table].[value]  = 'andy wipper<andy.wipper@company.com>'  )   ,      [ctefinal] ( select distinct [docsvsysreturn].[sid], [docsvsysreturn].[sparid]   [corecte]    join [docsvsys] [docsvsysreturn] (nolock)      on ( [docsvsysreturn].[sid] = [corecte].[sid]           or          ( [docsvsysreturn].[sparid] = [corecte].[sparid] , [docsvsysreturn].[sparid] = [docsvsysreturn].[sid] )        )    , [docsvsysreturn].[visibility] in (0) ) select [ctefinal].[sid], [ctefinal].[sparid]    [ctefinal]  order [ctefinal].[sid], ctefinal.[sparid]

this helped bit 

on ( [docsvsysreturn].[sid] = [corecte].[sid]       or      ( [docsvsysreturn].[sid] <> [corecte].[sid] , [docsvsysreturn].[sparid] = [corecte].[sparid] , [docsvsysreturn].[sparid] = [docsvsysreturn].[sid] )    )

i suggest try write query union instead. try out.

select [docsvsysreturn].[sid], [docsvsysreturn].[sparid]   [corecte]    join [docsvsys] [docsvsysreturn] (nolock)      on [docsvsysreturn].[sid] = [corecte].[sid]    , [docsvsysreturn].[visibility] in (0)  union  select [docsvsysreturn].[sid], [docsvsysreturn].[sparid]   [corecte]    join [docsvsys] [docsvsysreturn] (nolock)      on [docsvsysreturn].[sparid] = [corecte].[sparid]     , [docsvsysreturn].[sparid] = [docsvsysreturn].[sid]    , [docsvsysreturn].[visibility] in (0)

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