Initial support for DROP FUNCTION

[fulghum]

Adds initial support for DROP FUNCTION. (PostgreSQL Docs)

Two of the main features not supported yet are: cascading deletes of function dependencies, and restricting deletes when function dependencies are detected. The resolution of a type from its name also needs to fleshed out more to support types outside of the pg_catalog schema.

[github-actions]

	Main	PR
covering_index_scan_postgres	360.31/s	361.30/s	+0.2%
index_join_postgres	148.77/s	150.57/s	+1.2%
index_join_scan_postgres	181.42/s	181.13/s	-0.2%
index_scan_postgres	12.45/s	12.31/s	-1.2%
oltp_point_select	2727.62/s	2743.75/s	+0.5%
oltp_read_only	1855.85/s	1869.18/s	+0.7%
select_random_points	109.69/s	109.46/s	-0.3%
select_random_ranges	127.10/s	129.52/s	+1.9%
table_scan_postgres	10.88/s	10.89/s	0.0%
types_table_scan_postgres	5.51/s	5.51/s	0.0%

[github-actions]

	Main	PR
Total	42090	42090
Successful	15654	15685
Failures	26436	26405
Partial Successes1	5212	5213

	Main	PR
Successful	37.1917%	37.2654%
Failures	62.8083%	62.7346%

${\color{lightgreen}Progressions (32)}$

domain

QUERY: drop function array_elem_check(int);

QUERY: drop function dom_check(int);

drop_if_exists

QUERY: DROP FUNCTION IF EXISTS test_function_exists();

QUERY: DROP FUNCTION IF EXISTS no_such_schema.foo();

enum

QUERY: DROP FUNCTION echo_me(anyenum);

fast_default

QUERY: DROP FUNCTION foo(INT);

join

QUERY: drop function f_immutable_int4(int);

plpgsql

QUERY: drop function f1(x anyelement);

QUERY: select f1(stavalues1) from pg_statistic;

QUERY: select f1(stavalues1) from pg_statistic;

QUERY: drop function f1(int);

QUERY: drop function sp_add_user(text);

QUERY: drop function sp_id_user(text);

QUERY: drop function void_return_expr();

QUERY: drop function missing_return_expr();

QUERY: drop function shadowtest(int);

QUERY: drop function shadowtest();

QUERY: drop function compos();

QUERY: drop function compos();

QUERY: drop function compos();

QUERY: drop function zero_divide();

QUERY: drop function error2(p_name_table text);

QUERY: drop function cast_invoker(integer);

QUERY: drop function fail();

QUERY: drop function unreserved_test();

publication

QUERY: DROP FUNCTION testpub_rf_func2();

rangefuncs

QUERY: DROP FUNCTION getrngfunc8(int);

select_parallel

QUERY: drop function sp_simple_func(integer);

transactions

QUERY: DROP FUNCTION create_temp_tab();

QUERY: DROP FUNCTION invert(x float8);

union

QUERY: drop function expensivefunc(int);

updatable_views

QUERY: DROP FUNCTION leakproof(anyelement);

Footnotes

1. These are tests that we're marking as Successful, however they do not match the expected output in some way. This is due to small differences, such as different wording on the error messages, or the column names being incorrect while the data itself is correct. ↩

[Hydrocharged]

LGTM!