[jOOQ/jOOQ#9650] Add support for the Snowflake database

- Support for DATEDIFF()
- Support SET SCHEMA and SET CATALOG
- Support omittable sequence flags

jOOQ/src/main/java/org/jooq/impl/SetCatalog.java

@@ -102,6 +102,10 @@ extends
 
 
 
+
+
+
+
             case DERBY:
             case H2:
             case HSQLDB:

jOOQ/src/main/java/org/jooq/impl/SetSchema.java

@@ -104,6 +104,7 @@ extends
 
 
 
+
             case MARIADB:
             case MYSQL:
                 ctx.visit(K_USE).sql(' ').visit(schema);