plpgsql_check extension for PostgreSQL

 plpgsql_check is the next generation of plpgsql_lint for PL/pgsql source code.
 The SQL statements inside PL/pgSQL functions are checked for semantic errors.
 .
 Features:
  * check fields of referenced database objects and types inside embedded SQL
  * using correct types of function parameters
  * unused variables and function argumens, unmodified OUT argumens
  * partially detection of dead code (due RETURN command)
  * detection of missing RETURN command in function
  * try to identify unwanted hidden casts, that can be performance issue like
    unused indexes
  * possibility to collect relations and functions used by function
  * possibility to check EXECUTE stmt against SQL injection vulnerability