Column name for builtin functions does not match upstream

[jasobrown-rs]

Summary

The default column name for a builtin function that is used in a cached query does not match the upstream (at least for PG). Upstream PG defaults the column name to the simple name of the function, whereas readyset will append the parameter types to the function name (see below).

Expected behavior

Match the upstream naming: only function name is used (PG)

Actual behavior

function name and parameter types

Steps to reproduce

$ create table dogs (id int, name varchar(64), birth_date timestamptz default CURRENT_TIMESTAMP);

$ select date_trunc('minute', birth_date::timestamp) from dogs where id = 2;
     date_trunc      
---------------------
 2024-03-25 18:45:00
(1 row)

$ create cache from select date_trunc('minute', birth_date::timestamp) from dogs where id = 2;

$ select date_trunc('minute', birth_date::timestamp) from dogs where id = 2;
 date_trunc('minute', (`public`.`dogs`.`birth_date`::TIMESTAMP)) 
-----------------------------------------------------------------
 2024-03-25 18:45:00
(1 row)

Upstream DB type and version

PG, any version