fix: Update instrumentation pg to support merge statements #1317
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Summary
In postgres15+, the MERGE statement was added
https://www.postgresql.org/docs/current/sql-commands.html
https://www.postgresql.org/docs/current/sql-merge.html
we don't support it currently in our hard coded list of pg sql command constants(which was contributed before
MERGEwas added, iiuc), which results in missingdb.operationattributes anddb.statementattributes that look like;on pg spans formergestatements, which isn't very useful.This PR adds
MERGEto our constants list, and also cleans up some duplicate entries :)Notes
This was surfaced in cncf slack, i think my tests should pass but letting the ci do the work.
Hope everyone is doing well.