"David E. Wheeler" <da...@justatheory.com> writes:
> pgTAP has a function that compares two values of a given type, which it uses 
> for comparing column defaults. It looks like this:

>     CREATE OR REPLACE FUNCTION _def_is( TEXT, TEXT, anyelement, TEXT )

Given that you're coercing both one input value and the result to text,
I don't understand why you don't just compare the text representations.

I'm also not very clear on what you mean by "comparing column defaults".
A column default is an expression (in the general case anyway), not just
a value of the type.

Maybe if you'd shown us the is() function, as well as a typical usage
of _def_is(), this would be less opaque.

                        regards, tom lane

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