Why does contain_leaked_vars believe MinMaxExpr is safe?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-hackers(at)postgreSQL(dot)org
Subject: Why does contain_leaked_vars believe MinMaxExpr is safe?
Date: 2015-05-12 23:22:41
Message-ID: 16539.1431472961@sss.pgh.pa.us
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MinMaxExpr is an implicit invocation of a btree comparison function.
Are we supposing that all of those are necessarily leakproof?

regards, tom lane

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