Avoid using backslash in SQL string literals

src/backend/columnar/sql/citus_columnar--11.1-1.sql

@@ -71,7 +71,7 @@ BEGIN
 -- from version 12 and up we have support for tableam's if installed on pg11 we can't
 -- create the objects here. Instead we rely on citus_finish_pg_upgrade to be called by the
 -- user instead to add the missing objects
-IF substring(current_Setting('server_version'), '\d+')::int >= 12 THEN
+IF substring(current_Setting('server_version'), '[0-9]+')::int >= 12 THEN
   EXECUTE $$
 --#include "udfs/columnar_handler/10.0-1.sql"
 CREATE OR REPLACE FUNCTION columnar.columnar_handler(internal)

src/backend/columnar/sql/columnar--10.0-3--10.1-1.sql

@@ -4,7 +4,7 @@
 -- Postgres assigns different names to those foreign keys in PG11, so act accordingly.
 DO $proc$
 BEGIN
-IF substring(current_Setting('server_version'), '\d+')::int >= 12 THEN
+IF substring(current_Setting('server_version'), '[0-9]+')::int >= 12 THEN
   EXECUTE $$
 ALTER TABLE columnar.chunk DROP CONSTRAINT chunk_storage_id_stripe_num_chunk_group_num_fkey;
 ALTER TABLE columnar.chunk_group DROP CONSTRAINT chunk_group_storage_id_stripe_num_fkey;

src/backend/columnar/sql/columnar--9.5-1--10.0-1.sql

@@ -67,7 +67,7 @@ BEGIN
 -- from version 12 and up we have support for tableam's if installed on pg11 we can't
 -- create the objects here. Instead we rely on citus_finish_pg_upgrade to be called by the
 -- user instead to add the missing objects
-IF substring(current_Setting('server_version'), '\d+')::int >= 12 THEN
+IF substring(current_Setting('server_version'), '[0-9]+')::int >= 12 THEN
   EXECUTE $$
 #include "udfs/columnar_handler/10.0-1.sql"
 #include "udfs/alter_columnar_table_set/10.0-1.sql"

src/backend/columnar/sql/downgrades/columnar--10.0-1--9.5-1.sql

@@ -5,7 +5,7 @@ SET search_path TO columnar;
 DO $proc$
 BEGIN
 
-IF substring(current_Setting('server_version'), '\d+')::int >= 12 THEN
+IF substring(current_Setting('server_version'), '[0-9]+')::int >= 12 THEN
   EXECUTE $$
     DROP FUNCTION pg_catalog.alter_columnar_table_reset(
         table_name regclass,

src/backend/columnar/sql/udfs/columnar_ensure_objects_exist/10.0-1.sql

@@ -15,7 +15,7 @@ BEGIN
 
 -- when postgres is version 12 or above we need to create the tableam. If the tableam
 -- exist we assume all objects have been created.
-IF substring(current_Setting('server_version'), '\d+')::int >= 12 THEN
+IF substring(current_Setting('server_version'), '[0-9]+')::int >= 12 THEN
 IF NOT EXISTS (SELECT 1 FROM pg_am WHERE amname = 'columnar') THEN
 
 #include "../columnar_handler/10.0-1.sql"

src/backend/columnar/sql/udfs/columnar_ensure_objects_exist/latest.sql

@@ -15,7 +15,7 @@ BEGIN
 
 -- when postgres is version 12 or above we need to create the tableam. If the tableam
 -- exist we assume all objects have been created.
-IF substring(current_Setting('server_version'), '\d+')::int >= 12 THEN
+IF substring(current_Setting('server_version'), '[0-9]+')::int >= 12 THEN
 IF NOT EXISTS (SELECT 1 FROM pg_am WHERE amname = 'columnar') THEN
 
 #include "../columnar_handler/10.0-1.sql"

src/backend/distributed/sql/citus--8.0-1.sql

@@ -323,7 +323,7 @@ CREATE TRIGGER dist_shard_cache_invalidate
 
 DO $proc$
 BEGIN
-IF substring(current_Setting('server_version'), '\d+')::int >= 14 THEN
+IF substring(current_Setting('server_version'), '[0-9]+')::int >= 14 THEN
     EXECUTE $$
 CREATE AGGREGATE array_cat_agg(anycompatiblearray) (SFUNC = array_cat, STYPE = anycompatiblearray);
 COMMENT ON AGGREGATE array_cat_agg(anycompatiblearray)

src/backend/distributed/sql/udfs/any_value/latest.sql

@@ -1,7 +1,7 @@
 DO $proc$
 BEGIN
 -- PG16 has its own any_value, so only create it pre PG16.
-IF substring(current_Setting('server_version'), '\d+')::int < 16 THEN
+IF substring(current_Setting('server_version'), '[0-9]+')::int < 16 THEN
     EXECUTE $$
 
 CREATE OR REPLACE FUNCTION pg_catalog.any_value_agg ( anyelement, anyelement )

src/backend/distributed/sql/udfs/citus_finish_citus_upgrade/latest.sql

@@ -18,7 +18,7 @@ BEGIN
 	FROM pg_dist_node_metadata;
 
 	SELECT r[1], r[2], r[3]
-	FROM regexp_matches(last_upgrade_version_string,'([0-9]+)\.([0-9]+)-([0-9]+)','') r
+	FROM regexp_matches(last_upgrade_version_string,'([0-9]+)[.]([0-9]+)-([0-9]+)','') r
 	INTO last_upgrade_major_version, last_upgrade_minor_version, last_upgrade_sqlpatch_version;
 
 	IF last_upgrade_major_version IS NULL OR last_upgrade_minor_version IS NULL OR last_upgrade_sqlpatch_version IS NULL THEN

src/backend/distributed/sql/udfs/citus_finish_pg_upgrade/latest.sql

@@ -10,7 +10,7 @@ DECLARE
 BEGIN
 
 
-    IF substring(current_Setting('server_version'), '\d+')::int >= 14 THEN
+    IF substring(current_Setting('server_version'), '[0-9]+')::int >= 14 THEN
     EXECUTE $cmd$
         -- disable propagation to prevent EnsureCoordinator errors
         -- the aggregate created here does not depend on Citus extension (yet)
@@ -53,7 +53,7 @@ BEGIN
 
     -- PG16 has its own any_value, so only create it pre PG16.
     -- We can remove this part when we drop support for PG16
-    IF substring(current_Setting('server_version'), '\d+')::int < 16 THEN
+    IF substring(current_Setting('server_version'), '[0-9]+')::int < 16 THEN
     EXECUTE $cmd$
         -- disable propagation to prevent EnsureCoordinator errors
         -- the aggregate created here does not depend on Citus extension (yet)

src/backend/distributed/transaction/transaction_recovery.c

@@ -474,7 +474,7 @@ PendingWorkerTransactionList(MultiConnection *connection)
 	int32 coordinatorId = GetLocalGroupId();
 
 	appendStringInfo(command, "SELECT gid FROM pg_prepared_xacts "
-							  "WHERE gid LIKE 'citus\\_%d\\_%%' and database = current_database()",
+							  "WHERE gid LIKE 'citus/_%d/_%%' ESCAPE '/' and database = current_database()",
 					 coordinatorId);
 
 	int querySent = SendRemoteCommand(connection, command->data);