Filter by templated schema name for postgres queries (#21635)

There were certain queries which did not filter
by the current schema, but hardcoded public schema.

Apart from that, we always filter with the current schema
which allows connection proxies to run multiple MM within
a single DB.
```release-note
NONE
```

db/migrations/postgres/000001_create_teams.up.sql

@@ -35,6 +35,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'teams'
+    AND table_schema = current_schema()
     AND column_name = 'alloweddomains'
     AND NOT data_type = 'varchar(1000)';
 IF column_exist THEN
@@ -49,6 +50,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'teams'
+    AND table_schema = current_schema()
     AND column_name = 'groupconstrained'
     AND NOT data_type = 'boolean';
 IF column_exist THEN
@@ -63,6 +65,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'teams'
+    AND table_schema = current_schema()
     AND column_name = 'type'
     AND NOT data_type = 'varchar(255)';
 IF column_exist THEN
@@ -77,6 +80,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'teams'
+    AND table_schema = current_schema()
     AND column_name = 'schemeid'
     AND NOT data_type = 'varchar(26)';
 IF column_exist THEN

db/migrations/postgres/000013_create_incoming_webhooks.up.sql

@@ -63,6 +63,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'incomingwebhooks'
+    AND table_schema = current_schema()
     AND column_name = 'description'
     AND NOT data_type = 'VARCHAR(500)';
 IF column_exist THEN

db/migrations/postgres/000014_create_outgoing_webhooks.up.sql

@@ -30,6 +30,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'outgoingwebhooks'
+    AND table_schema = current_schema()
     AND column_name = 'description'
     AND NOT data_type = 'VARCHAR(500)';
 IF column_exist THEN
@@ -44,6 +45,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'outgoingwebhooks'
+    AND table_schema = current_schema()
     AND column_name = 'iconurl'
     AND NOT data_type = 'VARCHAR(1024)';
 IF column_exist THEN
@@ -56,7 +58,7 @@ BEGIN
     IF (
         SELECT column_default::bigint
         FROM information_schema.columns
-        WHERE table_schema='public'
+        WHERE table_schema=current_schema()
         AND table_name='outgoingwebhooks'
         AND column_name='username'
     ) = 0 THEN
@@ -69,7 +71,7 @@ BEGIN
     IF (
         SELECT column_default::bigint
         FROM information_schema.columns
-        WHERE table_schema='public'
+        WHERE table_schema=current_schema()
         AND table_name='outgoingwebhooks'
         AND column_name='iconurl'
     ) = 0 THEN

db/migrations/postgres/000020_create_posts.up.sql

@@ -42,6 +42,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'posts'
+    AND table_schema = current_schema()
     AND column_name = 'fileids'
     AND NOT data_type = 'varchar(300)';
 IF column_exist THEN

db/migrations/postgres/000026_create_preferences.up.sql

@@ -18,11 +18,13 @@ BEGIN
     SELECT count(*) != 0 INTO col_exists
     FROM information_schema.columns
     WHERE table_name = 'preferences'
+    AND table_schema = current_schema()
     AND column_name = 'value';
 
     SELECT count(*) != 0 INTO type_exists
     FROM information_schema.columns
     WHERE table_name = 'preferences'
+    AND table_schema = current_schema()
     AND column_name = 'value'
     AND data_type = 'character varying'
     AND character_maximum_length = 2000;

db/migrations/postgres/000028_create_tokens.up.sql

@@ -16,11 +16,13 @@ BEGIN
     SELECT count(*) != 0 INTO col_exists
     FROM information_schema.columns
     WHERE table_name = 'tokens'
+    AND table_schema = current_schema()
     AND column_name = 'extra';
 
     SELECT count(*) != 0 INTO type_exists
     FROM information_schema.columns
     WHERE table_name = 'tokens'
+    AND table_schema = current_schema()
     AND column_name = 'extra'
     AND data_type = 'character varying'
     AND character_maximum_length = 2048;

db/migrations/postgres/000033_create_sidebar_channels.down.sql

@@ -6,6 +6,7 @@ BEGIN
     SELECT count(*) != 0 INTO col_exist_and_type_different
     FROM information_schema.columns
     WHERE table_name = 'sidebarchannels'
+    AND table_schema = current_schema()
     AND column_name = 'categoryid'
     AND data_type = 'character varying'
     AND NOT character_maximum_length = 26;

db/migrations/postgres/000033_create_sidebar_channels.up.sql

@@ -14,6 +14,7 @@ BEGIN
     SELECT count(*) != 0 INTO col_exist_and_type_different
     FROM information_schema.columns
     WHERE table_name = 'sidebarchannels'
+    AND table_schema = current_schema()
     AND column_name = 'categoryid'
     AND data_type = 'character varying'
     AND NOT character_maximum_length = 128;

db/migrations/postgres/000034_create_oauthauthdata.up.sql

@@ -19,11 +19,13 @@ BEGIN
     SELECT count(*) != 0 INTO col_exists
     FROM information_schema.columns
     WHERE table_name = 'oauthauthdata'
+    AND table_schema = current_schema()
     AND column_name = 'state';
 
     SELECT count(*) != 0 INTO type_exists
     FROM information_schema.columns
     WHERE table_name = 'oauthauthdata'
+    AND table_schema = current_schema()
     AND column_name = 'state'
     AND data_type = 'character varying'
     AND character_maximum_length = 1024;

db/migrations/postgres/000040_create_sidebar_categories.down.sql

@@ -9,6 +9,7 @@ BEGIN
     SELECT count(*) != 0 INTO col_exist_and_type_different
     FROM information_schema.columns
     WHERE table_name = 'sidebarcategories'
+    AND table_schema = current_schema()
     AND column_name = 'id'
     AND data_type = 'character varying'
     AND NOT character_maximum_length = 26;

db/migrations/postgres/000040_create_sidebar_categories.up.sql

@@ -17,6 +17,7 @@ BEGIN
     SELECT count(*) != 0 INTO col_exist_and_type_different
     FROM information_schema.columns
     WHERE table_name = 'sidebarcategories'
+    AND table_schema = current_schema()
     AND column_name = 'id'
     AND data_type = 'character varying'
     AND NOT character_maximum_length = 128;

db/migrations/postgres/000045_create_plugin_key_value_store.down.sql

@@ -2,7 +2,7 @@ DO $$BEGIN
     IF (
         SELECT column_default::bigint
         FROM information_schema.columns
-        WHERE table_schema='public'
+        WHERE table_schema=current_schema()
         AND table_name='pluginkeyvaluestore'
         AND column_name='expireat'
     ) IS NULL THEN

db/migrations/postgres/000045_create_plugin_key_value_store.up.sql

@@ -11,7 +11,7 @@ DO $$BEGIN
     IF (
         SELECT column_default::bigint
         FROM information_schema.columns
-        WHERE table_schema='public'
+        WHERE table_schema=current_schema()
         AND table_name='pluginkeyvaluestore'
         AND column_name='expireat'
     ) = 0 THEN

db/migrations/postgres/000046_create_users.up.sql

@@ -54,6 +54,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'users'
+    AND table_schema = current_schema()
     AND column_name = 'roles'
     AND NOT data_type = 'varchar(256)';
 IF column_exist THEN

db/migrations/postgres/000049_create_channels.down.sql

@@ -12,6 +12,7 @@ BEGIN
     SELECT count(*) != 0 INTO col_exist_and_type_different
     FROM information_schema.columns
     WHERE table_name = 'channels'
+    AND table_schema = current_schema()
     AND column_name = 'groupconstrained'
     AND NOT data_type = 'boolean';
 
@@ -36,6 +37,7 @@ BEGIN
     SELECT count(*) != 0 INTO col_exist_and_type_different
     FROM information_schema.columns
     WHERE table_name = 'channels'
+    AND table_schema = current_schema()
     AND column_name = 'purpose'
     AND data_type = 'character varying'
     AND NOT character_maximum_length = 64;

db/migrations/postgres/000049_create_channels.up.sql

@@ -35,6 +35,7 @@ BEGIN
     SELECT count(*) != 0 INTO col_exist_and_type_different
     FROM information_schema.columns
     WHERE table_name = 'channels'
+    AND table_schema = current_schema()
     AND column_name = 'purpose'
     AND data_type = 'character varying'
     AND NOT character_maximum_length = 250;
@@ -60,6 +61,7 @@ BEGIN
     SELECT count(*) != 0 INTO col_exist_and_type_different
     FROM information_schema.columns
     WHERE table_name = 'channels'
+    AND table_schema = current_schema()
     AND column_name = 'groupconstrained'
     AND NOT data_type = 'boolean';
 

db/migrations/postgres/000051_create_msg_root_count.up.sql

@@ -10,11 +10,13 @@ BEGIN
 SELECT count(*) != 0 INTO msg_count_root_exist
     FROM information_schema.columns
     WHERE table_name = 'channels'
+    AND table_schema = current_schema()
     AND column_name = 'totalmsgcountroot';
 
  SELECT count(*) != 0 INTO mention_count_root_exist
     FROM information_schema.columns
     WHERE table_name = 'channelmembers'
+    AND table_schema = current_schema()
     AND column_name = 'mentioncountroot';
 
 IF mention_count_root_exist THEN

db/migrations/postgres/000057_upgrade_command_webhooks_v6.0.up.sql

@@ -6,6 +6,7 @@ BEGIN
 SELECT count(*) != 0 INTO parentid_exist
     FROM information_schema.columns
     WHERE table_name = 'commandwebhooks'
+    AND table_schema = current_schema()
     AND column_name = 'parentid';
 IF parentid_exist THEN
     UPDATE commandwebhooks SET rootid = parentid WHERE rootid = '' AND rootid != parentid;

db/migrations/postgres/000066_upgrade_posts_v6.0.up.sql

@@ -8,16 +8,19 @@ BEGIN
 SELECT count(*) != 0 INTO parentid_exist
     FROM information_schema.columns
     WHERE table_name = 'posts'
+    AND table_schema = current_schema()
     AND column_name = 'parentid';
 SELECT count(*) != 0 INTO alter_fileids
     FROM information_schema.columns
     WHERE table_name = 'posts'
+    AND table_schema = current_schema()
     AND column_name = 'fileids'
     AND data_type = 'character varying'
     AND character_maximum_length != 300;
 SELECT count(*) != 0 INTO alter_props
     FROM information_schema.columns
     WHERE table_name = 'posts'
+    AND table_schema = current_schema()
     AND column_name = 'props'
     AND data_type != 'jsonb';
 IF alter_fileids OR alter_props THEN

db/migrations/postgres/000067_upgrade_channelmembers_v6.1.down.sql

@@ -5,6 +5,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'channelmembers'
+    AND table_schema = current_schema()
     AND column_name = 'roles'
     AND NOT data_type = 'varchar(64)';
 IF column_exist THEN

db/migrations/postgres/000067_upgrade_channelmembers_v6.1.up.sql

@@ -5,6 +5,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'channelmembers'
+    AND table_schema = current_schema()
     AND column_name = 'roles'
     AND NOT data_type = 'varchar(256)';
 IF column_exist THEN

db/migrations/postgres/000068_upgrade_teammembers_v6.1.down.sql

@@ -5,6 +5,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'teammembers'
+    AND table_schema = current_schema()
     AND column_name = 'roles'
     AND NOT data_type = 'varchar(64)';
 IF column_exist THEN

db/migrations/postgres/000068_upgrade_teammembers_v6.1.up.sql

@@ -5,6 +5,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'teammembers'
+    AND table_schema = current_schema()
     AND column_name = 'roles'
     AND NOT data_type = 'varchar(256)';
 IF column_exist THEN

db/migrations/postgres/000070_upgrade_cte_v6.1.up.sql

@@ -9,6 +9,7 @@ BEGIN
 		information_schema.columns
 	WHERE
 		table_name = 'channels'
+		AND table_schema = current_schema()
 		AND column_name = 'lastrootpostat';
 	IF NOT column_exist THEN
 		ALTER TABLE channels ADD COLUMN lastrootpostat bigint DEFAULT '0'::bigint;

db/migrations/postgres/000071_upgrade_sessions_v6.1.down.sql

@@ -5,6 +5,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'sessions'
+    AND table_schema = current_schema()
     AND column_name = 'roles'
     AND NOT data_type = 'varchar(64)';
 IF column_exist THEN

db/migrations/postgres/000071_upgrade_sessions_v6.1.up.sql

@@ -5,6 +5,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'sessions'
+    AND table_schema = current_schema()
     AND column_name = 'roles'
     AND NOT data_type = 'varchar(256)';
 IF column_exist THEN

db/migrations/postgres/000073_upgrade_plugin_key_value_store_v6.3.down.sql

@@ -5,6 +5,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'pluginkeyvaluestore'
+    AND table_schema = current_schema()
     AND column_name = 'pkey'
     AND NOT data_type = 'varchar(50)';
 IF column_exist THEN

db/migrations/postgres/000073_upgrade_plugin_key_value_store_v6.3.up.sql

@@ -5,6 +5,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'pluginkeyvaluestore'
+    AND table_schema = current_schema()
     AND column_name = 'pkey'
     AND NOT data_type = 'varchar(150)';
 IF column_exist THEN

db/migrations/postgres/000076_upgrade_lastrootpostat.up.sql

@@ -3,7 +3,7 @@ BEGIN
 	IF (
 		SELECT count(*)
 		FROM information_schema.columns
-		WHERE table_schema='public'
+		WHERE table_schema=current_schema()
 		AND table_name='channels'
 		AND column_name='lastrootpostat'
 		AND (column_default IS NULL OR column_default != '''0''::bigint')

db/migrations/postgres/000082_upgrade_oauth_mattermost_app_id.down.sql

@@ -5,6 +5,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'oauthapps'
+    AND table_schema = current_schema()
     AND column_name = 'mattermostappid';
 IF column_exist THEN
     ALTER TABLE OAuthApps ALTER COLUMN MattermostAppID DROP NOT NULL;

db/migrations/postgres/000082_upgrade_oauth_mattermost_app_id.up.sql

@@ -5,6 +5,7 @@ BEGIN
 SELECT count(*) != 0 INTO column_exist
     FROM information_schema.columns
     WHERE table_name = 'oauthapps'
+    AND table_schema = current_schema()
     AND column_name = 'mattermostappid';
 IF column_exist THEN
     UPDATE OAuthApps SET MattermostAppID = '' WHERE MattermostAppID IS NULL;

db/migrations/postgres/000088_remaining_migrations.up.sql

@@ -10,6 +10,7 @@ BEGIN
     SELECT count(*) != 0 INTO col_exist
     FROM information_schema.columns
     WHERE table_name = 'users'
+    AND table_schema = current_schema()
     AND column_name = 'themeprops';
 
     IF col_exist THEN