Overloading

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Goal Make sure that there is genuine overloading instead of duplication or dead code. "In some programming languages, function overloading or method overloading is the ability to create multiple functions of the same name with different implementations." (Wikipedia) In PostgreSQL one can do it automagically by having multiple routines with the same name but different parameters in the same schema.
Notes In case of the string_agg function, the line break (br) tag is used as a part of the separator for the better readability in case the query result is displayed in a web browser. The query does not consider routines that are a part of an extension.
Type General (Overview of some aspect of the database.)
License MIT License
Data Source INFORMATION_SCHEMA+system catalog
SQL Query 
WITH routines AS (SELECT specific_schema, translate(substring(specific_name,'_[0-9]+$'),'_','')::int::oid AS routine_oid, routine_name, routine_type
FROM information_schema.routines
WHERE specific_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
AND NOT EXISTS (SELECT 1
FROM pg_catalog.pg_depend d inner join pg_catalog.pg_proc pc ON d.objid=pc.oid
WHERE EXISTS (SELECT 1 FROM pg_catalog.pg_extension e WHERE d.refobjid=e.oid) AND
pc.proname || '_' || pc.oid = routines.specific_name))
SELECT specific_schema, routine_name, routine_type, Count(*) AS number_of_routines, 
string_agg(CASE WHEN pg_get_function_identity_arguments(routine_oid)='' THEN 'No parameters' ELSE pg_get_function_identity_arguments(routine_oid) END, ';
' ) AS parameters
FROM routines
GROUP BY specific_schema, routine_name, routine_type
HAVING Count(*)>1
ORDER BY specific_schema, routine_name, routine_type;
Collections

This query belongs to the following collections:

NameDescription
Find problems by overviewQueries that results point to different aspects of database that might have problems. A human reviewer has to decide based on the results as to whether there are problems or not .
Categories

This query is classified under the following categories:

NameDescription
Comfortability of database evolutionQueries of this category provide information about the means that influence database evolution.
Duplication of implementation elementsQueries of this catergory provide information about the duplication of the database objects.
OverloadingQueries of this category provide information about overloading of routines.
User-defined routinesQueries of this category provide information about the user-defined routines