trino: Support FROM_HEX

src/scope.rs

@@ -266,6 +266,7 @@ EXP = Fn(FLOAT64) -> FLOAT64;
 FARM_FINGERPRINT = Fn(STRING) -> INT64 | Fn(BYTES) -> INT64;
 FIRST_VALUE = FnOver<?T>(Agg<?T>) -> ?T;
 FORMAT_DATETIME = Fn(DATETIME, STRING) -> STRING;
+FROM_HEX = Fn(STRING) -> BYTES;
 GENERATE_DATE_ARRAY = Fn(DATE, DATE, INTERVAL) -> ARRAY<DATE>;
 GENERATE_UUID = Fn() -> STRING;
 GREATEST = Fn<?T>(?T, ..?T) -> ?T;

tests/sql/functions/simple/to_hex_from_hex.sql

@@ -0,0 +1,15 @@
+-- TO_HEX(FROM_HEX(x)) = x
+
+CREATE OR REPLACE TABLE __result1 AS
+SELECT
+    to_hex(from_hex('8f4343a7')) AS hex_arg,
+    to_hex(from_hex(null)) AS null_arg;
+
+CREATE OR REPLACE TABLE __expected1 (
+    hex_arg STRING,
+    null_arg STRING,
+);
+
+INSERT INTO __expected1 VALUES
+  ('8f4343a7', NULL);
+