diff --git a/docker/trino/install-udfs b/docker/trino/install-udfs
index 9d2f639..1b2a7b0 100755
--- a/docker/trino/install-udfs
+++ b/docker/trino/install-udfs
@@ -8,6 +8,7 @@ set -euo pipefail
 
 # URL of our Trino server.
 trino_url="${1:-"http://localhost:8080"}"
+#echo trino_url: "$trino_url"
 
 until curl -s "$trino_url/v1/info" | grep -q '"starting":false'; do sleep 1; done
 trino --file "/etc/trino/trino_compat.sql" "$trino_url"
diff --git a/sql/trino_compat.sql b/sql/trino_compat.sql
index 1faf788..3e74eb0 100644
--- a/sql/trino_compat.sql
+++ b/sql/trino_compat.sql
@@ -1,34 +1,34 @@
 -- Compatibility functions for Trino, needed to run code generated by Joinery.
 
-CREATE FUNCTION memory.joinery_compat.DATETIME(date VARCHAR)
+CREATE OR REPLACE FUNCTION memory.joinery_compat.DATETIME(date VARCHAR)
 RETURNS TIMESTAMP
 RETURNS NULL ON NULL INPUT
 RETURN (
   CAST(date AS TIMESTAMP)
 );
 
-CREATE FUNCTION memory.joinery_compat.DATETIME(date DATE)
+CREATE OR REPLACE FUNCTION memory.joinery_compat.DATETIME(date DATE)
 RETURNS TIMESTAMP
 RETURNS NULL ON NULL INPUT
 RETURN (
   CAST(date AS TIMESTAMP)
 );
 
-CREATE FUNCTION memory.joinery_compat.GENERATE_UUID()
+CREATE OR REPLACE FUNCTION memory.joinery_compat.GENERATE_UUID()
 RETURNS VARCHAR
 NOT DETERMINISTIC
 RETURN (
   CAST(UUID() AS VARCHAR)
 );
 
-CREATE FUNCTION memory.joinery_compat.SHA256_COMPAT(input VARCHAR)
+CREATE OR REPLACE FUNCTION memory.joinery_compat.SHA256_COMPAT(input VARCHAR)
 RETURNS VARBINARY
 RETURNS NULL ON NULL INPUT
 RETURN (
   SHA256(TO_UTF8(input))
 );
 
-CREATE FUNCTION memory.joinery_compat.SHA256_COMPAT(input VARBINARY)
+CREATE OR REPLACE FUNCTION memory.joinery_compat.SHA256_COMPAT(input VARBINARY)
 RETURNS VARBINARY
 RETURNS NULL ON NULL INPUT
 RETURN (
@@ -36,7 +36,7 @@ RETURN (
 );
 
 -- Handle odd BigQuery behaviour around the `pos` argument.
-CREATE FUNCTION memory.joinery_compat.SUBSTR_COMPAT(input VARCHAR, pos INT)
+CREATE OR REPLACE FUNCTION memory.joinery_compat.SUBSTR_COMPAT(input VARCHAR, pos INT)
 RETURNS VARCHAR
 RETURNS NULL ON NULL INPUT
 RETURN (
@@ -50,7 +50,7 @@ RETURN (
 
 -- As the two argument case, but also treat a length greater than the string as
 -- as "to the end of the string".
-CREATE FUNCTION memory.joinery_compat.SUBSTR_COMPAT(input VARCHAR, pos INT, len INT)
+CREATE OR REPLACE FUNCTION memory.joinery_compat.SUBSTR_COMPAT(input VARCHAR, pos INT, len INT)
 RETURNS VARCHAR
 RETURNS NULL ON NULL INPUT
 RETURN (
@@ -72,7 +72,7 @@ RETURN (
   END
 );
 
-CREATE FUNCTION memory.joinery_compat.TO_HEX_COMPAT(input VARBINARY)
+CREATE OR REPLACE FUNCTION memory.joinery_compat.TO_HEX_COMPAT(input VARBINARY)
 RETURNS VARCHAR
 RETURNS NULL ON NULL INPUT
 RETURN (