CREATE EXTENSION postgres_fdw;

SELECT current_database() AS current_database,
  current_setting('port') AS current_port
\gset

CREATE SERVER loopback FOREIGN DATA WRAPPER postgres_fdw
	OPTIONS (dbname :'current_database', port :'current_port');
CREATE USER MAPPING FOR CURRENT_USER SERVER loopback;

CREATE SCHEMA "S 1";

CREATE TABLE "S 1"."T 3" (
	c1 int NOT NULL,
	c2 int NOT NULL,
	c3 text,
	CONSTRAINT t3_pkey PRIMARY KEY (c1)
);

INSERT INTO "S 1"."T 3"
	SELECT id,
	       id + 1,
	       'AAA' || to_char(id, 'FM000')
	FROM generate_series(1, 10000) id;

ANALYZE "S 1"."T 3";

CREATE FOREIGN TABLE ft4 (
	c1 int NOT NULL,
	c2 int NOT NULL,
	c3 text
) SERVER loopback OPTIONS (schema_name 'S 1', table_name 'T 3');

explain (analyze, verbose) select min(c1) from "S 1"."T 3";
explain (analyze, verbose) select min(c1) from "S 1"."T 3";
explain (analyze, verbose) select min(c1) from "S 1"."T 3";
explain (analyze, verbose) select min(c2) from "S 1"."T 3";
explain (analyze, verbose) select min(c2) from "S 1"."T 3";
explain (analyze, verbose) select min(c2) from "S 1"."T 3";

ALTER FOREIGN TABLE ft4 OPTIONS (use_remote_estimate 'false');

explain (analyze, verbose) select min(c1) from ft4;
explain (analyze, verbose) select min(c1) from ft4;
explain (analyze, verbose) select min(c1) from ft4;
explain (analyze, verbose) select min(c2) from ft4;
explain (analyze, verbose) select min(c2) from ft4;
explain (analyze, verbose) select min(c2) from ft4;

ALTER FOREIGN TABLE ft4 OPTIONS (SET use_remote_estimate 'true');

explain (analyze, verbose) select min(c1) from ft4;
explain (analyze, verbose) select min(c1) from ft4;
explain (analyze, verbose) select min(c1) from ft4;
explain (analyze, verbose) select min(c2) from ft4;
explain (analyze, verbose) select min(c2) from ft4;
explain (analyze, verbose) select min(c2) from ft4;