Hello! The following series of statements results in an unexpected (to me) error on 18.0 and 18.1:
CREATE FUNCTION my_function_1(n integer) RETURNS integer AS 'SELECT n' LANGUAGE SQL IMMUTABLE;
CREATE FUNCTION my_function_2(n integer) RETURNS integer AS 'SELECT my_function_1(n)' LANGUAGE SQL IMMUTABLE;
CREATE SCHEMA my_schema;
CREATE TABLE my_schema.my_table (my_number integer);
CREATE INDEX my_index ON my_schema.my_table (my_number) WHERE my_function_2(my_number) = 4;
The CREATE INDEX fails with the following error:
ERROR: function my_function_1(integer) does not exist
LINE 1: SELECT my_function_1(n)
^
HINT: No function matches the given name and argument types. You might need to add explicit type casts.
QUERY: SELECT my_function_1(n)
CONTEXT: SQL function "my_function_2" during inlining
SQL state: 42883
If I change the definition of my_function_2 to 'SELECT public.my_function_1(n)' then the index builds successfully, so that's my current workaround.
Thank you!
