Adds comments describing shadow tests

src/test/regress/expected/multi_create_table_shadow.out

@@ -1,6 +1,8 @@
 --
 -- MULTI_CREATE_TABLE
 --
+-- Some of the tests fail but without them some other tests fail. So failing parts
+-- are removed to create shadow tests. This is one of them.
 ALTER SEQUENCE pg_catalog.pg_dist_shardid_seq RESTART 360000;
 ERROR:  must be owner of sequence pg_dist_shardid_seq
 ALTER SEQUENCE pg_catalog.pg_dist_colocationid_seq RESTART 100000;

src/test/regress/expected/multi_test_helpers_shadow.out

@@ -1,4 +1,6 @@
 -- File to create functions and helpers needed for subsequent tests
+-- Some of the tests fail but without them some other tests fail. So failing parts
+-- are removed to create shadow tests. This is one of them.
 -- create a helper function to create objects on each node
 CREATE OR REPLACE FUNCTION run_command_on_master_and_workers(p_sql text)
 RETURNS void LANGUAGE plpgsql AS $$

src/test/regress/input/multi_behavioral_analytics_create_table_shadow.source

@@ -2,6 +2,10 @@
 -- multi behavioral analytics
 -- this file is intended to create the table requires for the tests
 --
+
+-- Some of the tests fail but without them some other tests fail. So failing parts
+-- are removed to create shadow tests. This is one of them.
+
 SET citus.next_shard_id TO 1400000;
 SET citus.shard_replication_factor = 1;
 SET citus.shard_count = 32;

src/test/regress/input/multi_load_data_shadow.source

@@ -6,6 +6,9 @@
 -- citus.shard_max_size. These values are set in pg_regress_multi.pl. Shard placement
 -- policy is left to the default value (round-robin) to test the common install case.
 
+-- Some of the tests fail but without them some other tests fail. So failing parts
+-- are removed to create shadow tests. This is one of them.
+
 SET citus.next_shard_id TO 290000;
 
 \copy lineitem FROM '@abs_srcdir@/data/lineitem.1.data' with delimiter '|'

src/test/regress/output/multi_behavioral_analytics_create_table_shadow.source

@@ -2,6 +2,8 @@
 -- multi behavioral analytics
 -- this file is intended to create the table requires for the tests
 --
+-- Some of the tests fail but without them some other tests fail. So failing parts
+-- are removed to create shadow tests. This is one of them.
 SET citus.next_shard_id TO 1400000;
 SET citus.shard_replication_factor = 1;
 SET citus.shard_count = 32;

src/test/regress/output/multi_load_data_shadow.source

@@ -5,6 +5,8 @@
 -- of shards uploaded depends on two config values: citus.shard_replication_factor and
 -- citus.shard_max_size. These values are set in pg_regress_multi.pl. Shard placement
 -- policy is left to the default value (round-robin) to test the common install case.
+-- Some of the tests fail but without them some other tests fail. So failing parts
+-- are removed to create shadow tests. This is one of them.
 SET citus.next_shard_id TO 290000;
 \copy lineitem FROM '@abs_srcdir@/data/lineitem.1.data' with delimiter '|'
 \copy lineitem FROM '@abs_srcdir@/data/lineitem.2.data' with delimiter '|'

src/test/regress/sql/multi_create_table_shadow.sql

@@ -2,6 +2,9 @@
 -- MULTI_CREATE_TABLE
 --
 
+-- Some of the tests fail but without them some other tests fail. So failing parts
+-- are removed to create shadow tests. This is one of them.
+
 ALTER SEQUENCE pg_catalog.pg_dist_shardid_seq RESTART 360000;
 ALTER SEQUENCE pg_catalog.pg_dist_colocationid_seq RESTART 100000;
 

src/test/regress/sql/multi_test_helpers_shadow.sql

@@ -1,5 +1,8 @@
 -- File to create functions and helpers needed for subsequent tests
 
+-- Some of the tests fail but without them some other tests fail. So failing parts
+-- are removed to create shadow tests. This is one of them.
+
 -- create a helper function to create objects on each node
 CREATE OR REPLACE FUNCTION run_command_on_master_and_workers(p_sql text)
 RETURNS void LANGUAGE plpgsql AS $$