This causes the 42883 error, "function f(date) does not exist". I might've expected the system to have done an implicit conversion to "text" because this conversion is supported, thus:
Yes, implicit casting to text is bad.
For some reason, the implicit conversion from "date" to "timestamptz" _is_ considered to be preferable to the implicit conversion from "date" to plain "timestamp".Where, in the PG doc, can I find a statement of the rules that allow me to predict the outcome of my tests?
I do not believe the relevant metadata is maintained in the documentation. You would have to, at minimum, consult the system catalogs; as documented here:
Note that page does discuss the concept of “preference” that you’ve observed.
David J.
