Add simple follower test for columnar. (#4432)

src/test/regress/expected/follower_single_node.out

@@ -1,3 +1,6 @@
+SHOW server_version \gset
+SELECT substring(:'server_version', '\d+')::int >= 12 AS have_table_am
+\gset
 \c - - - :master_port
 CREATE SCHEMA single_node;
 SET search_path TO single_node;
@@ -349,6 +352,40 @@ SELECT count(*) FROM test WHERE false GROUP BY GROUPING SETS (x,y);
 (0 rows)
 
 RESET citus.task_assignment_policy;
+-- Simple columnar follower test
+\c -reuse-previous=off regression - - :master_port
+\if :have_table_am
+CREATE TABLE columnar_test (a int, b int) USING columnar;
+\else
+CREATE TABLE columnar_test (a int, b int);
+\endif
+INSERT INTO columnar_test(a, b) VALUES (1, 1);
+INSERT INTO columnar_test(a, b) VALUES (1, 2);
+TRUNCATE columnar_test;
+INSERT INTO columnar_test(a, b) VALUES (1, 3);
+INSERT INTO columnar_test(a, b) VALUES (1, 4);
+BEGIN;
+INSERT INTO columnar_test SELECT g, g*10
+  FROM generate_series(10001,20000) g;
+ROLLBACK;
+VACUUM columnar_test;
+INSERT INTO columnar_test(a, b) VALUES (1, 5);
+INSERT INTO columnar_test(a, b) VALUES (1, 6);
+VACUUM FULL columnar_test;
+INSERT INTO columnar_test(a, b) VALUES (1, 7);
+INSERT INTO columnar_test(a, b) VALUES (1, 8);
+\c - - - :follower_master_port
+SELECT * FROM columnar_test ORDER BY 1,2;
+ a | b
+---------------------------------------------------------------------
+ 1 | 3
+ 1 | 4
+ 1 | 5
+ 1 | 6
+ 1 | 7
+ 1 | 8
+(6 rows)
+
 -- Cleanup
 \c -reuse-previous=off regression - - :master_port
 SET search_path TO single_node;

src/test/regress/sql/follower_single_node.sql

@@ -1,3 +1,7 @@
+SHOW server_version \gset
+SELECT substring(:'server_version', '\d+')::int >= 12 AS have_table_am
+\gset
+
 \c - - - :master_port
 CREATE SCHEMA single_node;
 SET search_path TO single_node;
@@ -137,6 +141,34 @@ SELECT count(*) FROM test WHERE false;
 SELECT count(*) FROM test WHERE false GROUP BY GROUPING SETS (x,y);
 RESET citus.task_assignment_policy;
 
+-- Simple columnar follower test
+\c -reuse-previous=off regression - - :master_port
+
+\if :have_table_am
+CREATE TABLE columnar_test (a int, b int) USING columnar;
+\else
+CREATE TABLE columnar_test (a int, b int);
+\endif
+
+INSERT INTO columnar_test(a, b) VALUES (1, 1);
+INSERT INTO columnar_test(a, b) VALUES (1, 2);
+TRUNCATE columnar_test;
+INSERT INTO columnar_test(a, b) VALUES (1, 3);
+INSERT INTO columnar_test(a, b) VALUES (1, 4);
+BEGIN;
+INSERT INTO columnar_test SELECT g, g*10
+  FROM generate_series(10001,20000) g;
+ROLLBACK;
+VACUUM columnar_test;
+INSERT INTO columnar_test(a, b) VALUES (1, 5);
+INSERT INTO columnar_test(a, b) VALUES (1, 6);
+VACUUM FULL columnar_test;
+INSERT INTO columnar_test(a, b) VALUES (1, 7);
+INSERT INTO columnar_test(a, b) VALUES (1, 8);
+
+\c - - - :follower_master_port
+SELECT * FROM columnar_test ORDER BY 1,2;
+
 -- Cleanup
 \c -reuse-previous=off regression - - :master_port
 SET search_path TO single_node;