Unable to find the query functionalities for the below requirements.

Sample KVP format log  below -

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userId="Walter, robertwest" OnSrc="administrator, robertwest.sfo-winsrv-rc18, james, administrator, testuser987, svcfimadma_00y, steve, tyronedavis, robertwest, edwardpietsch" identityType="domain, domain, domain, domain, domain, domain, domain, domain, domain, domain"  isCompromised="false, false, false, false, false, false, false, false, false, false" isIdentityPrivileged="true, false, false, false, false, false, false, false, true, false" 

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all userId, OnSrc, identityType, isCompromised, isIdentityPrivileged fields have stringified list as values.

Requirement - 
step 1 - I want extract each value from userId field
step 2 - check wether extracted userId values present in OnSrc stringified list or not.
step 3 - If any userId is present in OnSrc field then what is the index of that presence value.
step 4 - then extract values from isIdentityPrivileged, isCompromised, identityType using the index value which was figured out in step 3

Expected output should be table -

UserId           isIdentityPrivileged  isCompromised  identityType
robertwest.    true                          false                   domain


Note - Walter got skipped in the table because this userId is not present in the  OnSrc field.
In splunk we were able achieve the same using mvfind(), mvindex() operators.