I'm writing a function that looks a little like this:
DROP FUNCTION IF EXISTS myfunction; CREATE OR REPLACE FUNCTION myfunction(arg1 uuid, _symbol text, _start timestamp with time zone, _end timestamp with time zone ) RETURNS TABLE (arg5 date, arg6 float) AS $$ WITH cte1 AS ( ... ),
cte2 AS ( ... ),
cte3 AS ( ... ),
cte4 AS ( ... ),
cte5 AS ( ... )
SELECT X as arg5, Y as arg6 FROM cte5; $$
The function is not returning the correct results; I think the problem is in cte2 or cte3. What's the easiest way to debug this? I would like to send some test inputs through the program, observe the output from cte3, and modify the values and see if I get the correct new answers. Here are the approaches I know right now:
- Modify the function return to contain the columns for cte3. (I don't think there is a way to indicate RETURNS * or similar wildcard)
- Reload the function.
- Call the function with the test arguments, and view the resulting table. Modify/reload/rerun as appropriate.
Or:
- Copy the function to another file.
- Delete the function prologue and epilogue
- Replace every use of the input arguments with the hardcoded values I want to test with
- Run the file, making changes as necessary.
This seems pretty cumbersome. Is there an easier way I am missing? Specifically it would be neat if it was easier to visualize the intermediate steps in the query production. If there are professional tools that help with this I would appreciate pointers to those as well.
