There is a test in privileges.sql (currently lines 589-625 in
privileges.out) that seems to be dependent on the fact that the
ArrayCoerceExpr logic doesn't check for EXECUTE privilege on the
per-element type coercion function if it's dealing with a NULL input

While fooling with Andres' faster-expressions patch, I moved the
pg_proc_aclcheck call for this into expression compilation, causing
that privileges.sql test to fail.

Since Andres' patch moves ACL checks for regular function calls into
expression compilation, I think it would be weird and inconsistent not
to do so for ArrayCoerceExpr as well.  Does anyone want to defend this
privileges test case as testing for some behavior that users expect?

                        regards, tom lane

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