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where to declare system operators - Mailing list pgsql-hackers

From Jackson, DeJuan
Subject where to declare system operators
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Msg-id F10BB1FAF801D111829B0060971D839F6478AC@cpsmail
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Could someone point me to where the operators are defined?
I'm trying to define a lower for varchar.  "Why?",  you may ask, so that
I can create a functional index on the lower of a varchar column.
Thanks,-DEJ

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