I'm also very interested by collecting "search_path" information for
statements,
but this information may not be unique for pg_stat_statements key
(dbid,userid,queryid) ...
How would this 1-N relation be handled ?
1/ just catch initial session_info for each (dbid,userid,queryid),
2/ adding a sessid field in pgss key, and a table for distinct
sessid,session_info values,
3/ store session_info in an array,
4/ ...
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