How to get oprname ??

Hello ,

I was trying to write a patch code in converting the querytree being 
generated after the pg_analyze_and_rewrite().
For that I want to know the operator name ( like =, < , <> etc ) .. but the 
Oper node stores the "opno "

How to get the operator from the opno ???

Thanks for the Help in advance,

Hals

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